Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fbb1d771f85235b…

MALICIOUS

PDF

85.7 KB Created: 2021-09-03 14:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 39b177fa97f0b2c4e8bf5e5c916bdc73 SHA-1: cc10f1d92de13125655226d5a536126a1b07536b SHA-256: 6fbb1d771f85235b90fbdcd4f26d4b9ea237d252b612a2936ebe47915a0517a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content. The document body is unreadable, but the heuristics indicate a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608387ee178dc---vodutute.pdf In PDF document text
    • http://firegallery.ru/img/upload/72223117986.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/ff473c96cd1f17b137e7b08ff1267a0f/51187596676.pdfIn PDF document text
    • http://sdds.be/userfiles/file/xifovad.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/75345445846.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/30f081ceea6793326ebec6f42b60550a/23215925188.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/dufatadinuduwasodopabe.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/jimajenojemigagoxoleroxev.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/36399069911.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/23415263939.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/84558761167.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/31307062325.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/32399578854.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16107d5c08c33a---kofujazigax.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/39e3c096c7b1fcb56eb6c84628b53071/dosisijoranejupokij.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/lowotosibowiguvaz.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/fazoli.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/0353c00535e878d912f389f3bbcb905f/ragiruz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba32e899ee3---tixebi.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/42675e5ebdef70479dd72be7de8e0b38/pimutogofatuvewixe.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c985be6a134---tezojatubap.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610448be0b5fc---42845132752.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/54079147742.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/radewisugiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=wolfgang+puck+bistro+rice+cooker+manualPDF 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_off0000e5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DC 11148 bytes
SHA-256: fbe173659fa1deaef9c67c9894fe8d50af16a900bab5512abd6e0364d094faef
font_01_sfnt_off0000ffc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D2 18596 bytes
SHA-256: e03ee3ed6cbd3b2ae24e8c0d9e8bb9cb855ee3aa1e2d8937a159968df37deabd