Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3f235375461adc…

MALICIOUS

PDF

117.6 KB Created: 2021-06-25 20:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a12910e1f4b7da23979c1fe8702e0452 SHA-1: 5656e12b515224e787ce97adb89cab26dca5045b SHA-256: 0a3f235375461adc7dab2e5ba56c58ac42e11fe2db5bf62c445f259b103e591b
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious payloads. Heuristics indicate the PDF acts as a link farm, pointing to numerous compromised websites and disposable hosting, likely to obscure the ultimate destination. The presence of urgency and invoice lures further supports a phishing or scamming intent. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload from one of the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irlanc.ru/uplcv?utm_term=shelltime+4+charter+party PDF link annotation
    • http://provia-events.de/pics/fotos/1/file/58046012220.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/98jscdcdhm9f2u8i56u7i2bcjl/dotegozesuwomiteni.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/gq3ousact6mhe142v9lf3g2vto/51268031915.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/humh5nltufj90cbv59iole8k4k/52933324744.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/70669829276.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/8bcbd850672e075355c70078476259ce/37917857220.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160878b9ed58b7---90213232033.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d35455627be---nokerelunurojabiwutub.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38f7795c0b---fabukegalunelewuroranogo.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/zitinadeboroxijap.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c73f4be28---girasetuf.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/a034f8332c630c69ec2d054df21e5dd7/99047527486.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e938a2c40c---23229648468.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/a860d45de74160ea98e803e04d1778e7/62183601578.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac34786ea5---55178235894.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/laxaputusinutaro.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609781a122f15---gawojete.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/32462235520.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/d2cdcq85ustur08hbtea63nq2k/41745473458.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/vajawup.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/teruridakovexexufu.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7534e8a51ab0d5394c9f88b68026b4ac/befuxarijipup.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001617d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1617D 17252 bytes
SHA-256: aed33f01a195fbe697318f05885f3761b6b5e2510e7b967c0059f79d29b9b4a3
font_01_sfnt_off00018eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EAE 1724 bytes
SHA-256: afea6973b2d3f8f00217c385444c8d77b616700c4fd28f3cc37968856b75f1d3
font_02_sfnt_off000196e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196E1 10512 bytes
SHA-256: b57de5aefe2386ba216f39f2c4b1b5b1db84fd3125eed5a5c8f65f538894f81c
font_03_sfnt_off0001aee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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