Malicious PDF — malware analysis report

Static analysis result for SHA-256 772a2e276c4fd45b…

MALICIOUS

PDF

75.7 KB Created: 2021-09-15 23:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8f6d77b0bc676d98642956c39be2c332 SHA-1: fcb7d4dda07c703c331766a786bf0ba7aae50168 SHA-256: 772a2e276c4fd45bec11be93ac13f8462ce2158894e64a82a6056d6df032b355
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://hcbarrett.com/user_area/file/samivikebudemeviziwugi.pdf In PDF document text
    • http://fc-junajted.com/upload/datoteke/43515189333.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/37197526507.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/92101523570.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/97737023064.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67854bd0501a9ce6f51bfbc4a299591b/bamejinutuguzijezevirelag.pdfIn PDF document text
    • http://salespate.com/userfiles/file/xonemefebobumolusesuruda.pdfIn PDF document text
    • http://zapcdn.space/web/img/podborky/files/xevijujapivup.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/balasenozinon.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613525c4af2a0---raxipekavodasobiw.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/65339117806.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/il61hdh9b7iphnn148t1erkpi1/tuwesif.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/mogij.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/90891748095.pdfIn PDF document text
    • https://phnews.ro/files/file/91887179596.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/19881417859.pdfIn PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/tatazomegemipuvemonator.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/16202467817.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/16951337511.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/benatilovuzobosi.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/litopelalameset.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/12670090699.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/tirapijadasurig.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368bfcee166---24059924607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=mona+full+movie+in+englishPDF 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_off0000c437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC437 17268 bytes
SHA-256: c5064c3c328f43f42ef99907811addfd825ddea1a9966850e905ef1487a62df2
font_01_sfnt_off0000f110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10927 10624 bytes
SHA-256: da0873efb1581389f84654769e8e226893ec37733b8d82f92740ac1435cecaad

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