Malicious PDF — malware analysis report

Static analysis result for SHA-256 73225ba68081ddc9…

MALICIOUS

PDF

83.6 KB Created: 2021-08-04 08:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 461064feacefde294cb91a86dc03b0fa SHA-1: bf43f558b9121431d4775f6cefc9d17b959e972b SHA-256: 73225ba68081ddc9d38c7665bd46f11d638b695b29139f6022a734f4ce3ab0f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm hosted on potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=marvel+super+heroes+vs+street+fighter+rom+fightcade PDF link annotation
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/72ef7d0e3ec23905c5321f814fddf5b4/90727608079.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/26222233604.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/jngjoe3dtdhshnckgdg578i0po/volibivukejasu.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930544d8985---21259126153.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160949cb866e06---wakumesazobejimizo.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16099ad196efaf---31886950002.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7c8476c2b---29070483174.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607731770240e---79137686182.pdfIn PDF document text
    • http://eastbrunswickliving.com/clients/77672/File/lunotutidok.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786300ba058---62316235753.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/43547292035.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16085b45b54fe7---lutepogipabevebozebi.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/jlr393dobvpi7f2ihgflf9acqq/xipalowo.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb484cd6bd4---kowamiroxetixijukes.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/42204975640.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4f86270df---xejonut.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/ecd9883317c20eb55bb5097d527e02e7/kitipojaxogiw.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/pazuwedexiku.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/51298517961.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/losuzogat.pdfIn PDF document text
    • https://wrd13.com/force/file/58122308543.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/zefefiva.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/27075750953.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/2b77328c03118ddbf91ced0078af60d1/rilufimipofusevorofudivav.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A9 17160 bytes
SHA-256: aa9ba8a04b4fda886b2805f78f7e87277fcecf7c394007807f51c38852b0fa85
font_01_sfnt_off00010ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDE 11124 bytes
SHA-256: 9d9e6541f824a4bf1706b4141e5683d4a9273bcc7fc18926842b012f319a45ba
font_02_sfnt_off000128ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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