Malicious PDF — malware analysis report

Static analysis result for SHA-256 7960cedac7a4c28f…

MALICIOUS

PDF

77.3 KB Created: 2021-07-07 03:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0ad3611c4245285ad1347bd91ae39e07 SHA-1: d9ea5c364da781f5c667717ba4dfe9834129f1bf SHA-256: 7960cedac7a4c28f863667dd02c5ed3657a54e421224b5dd673d9cfd69e3b7bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various compromised websites, indicating it functions as a link farm. This is a common tactic for phishing campaigns or distributing further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://shethof.ch/cgi-bin/dynamisch/file/wutasozuneripisemezus.pdf In PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/22d8dcaeffaa3eb8cbd3fdd415a1c27b/89686420346.pdfIn PDF document text
    • http://smn69.com/clients/866038/File/76769541074.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ab72734ba---zugezim.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d83e346aefed29e165cbae5f8ad5f2b3/5942940320.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6b2b1ee38---kuwilubifinusas.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/verawadegijoleberobukaf.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/vudezose.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9c28e37e7---47165056496.pdfIn PDF document text
    • http://masonfamilyreunion.org/clients/b/bd/bdaf0a3c19eb5f10f0519c747c117e37/File/57040885440.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/79118860656.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/c624c8209f07417dc787fbd19bd62f13/27804420081.pdfIn PDF document text
    • http://shhs69reunions.com/clients/e/e9/e92da0bc0099326815942f81a5c18dfc/File/jorafosupimovawixurabo.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/3ee265060b86aeea2a2b9a0a62c06d73/dizojosasejuduj.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ea21ce959---zarunumat.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/xozajobuwevujo.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/99431869404.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985e1776a83---pijekotavuxir.pdfIn PDF document text
    • https://szaktel.hu/uploads/file/52236235242.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/fiwudik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+make+wool+with+string+in+minecraftPDF 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_off0000ca41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA41 10952 bytes
SHA-256: 9a712e1373ef82b15e70902e998be47306e5fcc5e864c4548e27134111ac9b21
font_01_sfnt_off0000e37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB91 17112 bytes
SHA-256: b7c5b2dc16aaf19d0746fa84aa9d53f4892ff978a1b30b3f30a25cde2ab0cb11

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