Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6f5af67b687b6c…

MALICIOUS

PDF

91.2 KB Created: 2021-08-29 05:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3b6bf6976ef0d88011b363fa455fe613 SHA-1: c292188555e5939ee2bfc21aac7b72d333fb65ec SHA-256: 5a6f5af67b687b6cea201fb1f8e3ae3857609cf9e052c0292291e4cc23c00289
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. Heuristics indicate urgency and invoice lures, combined with a high ML score and ClamAV detection, strongly suggest a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 http://bugaboo-buffalo.eu/UserFiles/File/tuzadafijekoto.pdf In PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/50426463601.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076109da72a1---biwanufifunetaw.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160818292ac522---jimaxupapopevitufalizu.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/toxebikawaxilipik.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7c09a4941---tusarokeg.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/93216676521.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a286d1550f2---26537934756.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/76940705182.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/8adc442b280b135b60cf23b089aafe20/tojesotozatomometozunawu.pdfIn PDF document text
    • https://bangkoksolarpower.com/syner_upload/images/files/92735597979.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607031f7d723a---2668591459.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fb67cc39f---rimofosagupitogezekotiw.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9721b83be---59679330845.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/39021663639.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83d2a3f739---49407543600.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/wotenowazogawovinabox.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/minadideferik.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e7269d547---dibekixegumixapetapeze.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/vigawi.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/41232103174.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/76198199737.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/99833102749.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/90267503940.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086186ce67bc---97315321139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=10th+doctor+who+quotesPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF55 10472 bytes
SHA-256: 3c505e3c3288cb29d6f16a4a2b9cc4adb02faebacbd3571f03ce66bda251e054
font_01_sfnt_off0001171e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F30 18304 bytes
SHA-256: 9ccace1e15f9fe2507314577b3ced6321659ef90572997554bb77659cecbc77e