Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e252a57554cc9d9…

MALICIOUS

PDF

84.9 KB Created: 2021-06-30 08:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a4a44d08c38457c932323fe067ae286 SHA-1: c0cefaf7d1af39fd4133e25c9ea923e0a7eed78f SHA-256: 7e252a57554cc9d953b0c8c596b2263203efaa0fe3d83e39b5f2c8e837c4ddb8
196 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 WordPress installations or disposable domains, indicating a link farm for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/8650367ff506d73680771677ebc87b27/gozekarisewaziwivirogonu.pdf
    • http://alexhofford.com/temp/files/file/21541280820.pdf
    • http://naszymsladem.pl/upload/file/derobanoxefigot.pdf
    • http://sl-light.ru/design/img/upload/file/59843183267.pdf
    • https://aawyx.com/sites/default/imageuser/file/86901013548.pdf
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/22726830550.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d57d8f221---86203797369.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efc7e319a0---58818432718.pdf
    • http://parejalecaros.com/adjunto/upload/fck/files/50658125438.pdf
    • http://slbreakingnews.com/ckfinder/userfiles/files/10841239651.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/uus822q0lm0hlcj1nlap05d3v8/rariwa.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082eb8877220---33874467461.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/46ae2d09a5c9cb72ff2b1626675318fe/41623314210.pdf
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/61308004402.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f24dc53bc9---pivariromuzipoz.pdf
    • https://comobrew.com/newsite/images/user_uploads/file/xiwemifor.pdf
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/jumoputopotaperazituno.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8e899c022---51980187031.pdf
    • https://pasarantogelsatu.com/contents//files/63265383321.pdf
    • http://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/94502733365.pdf
    • https://childrencareandliteracysociety.org/userfiles/files/bexajevotesekok.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2827477dc---74354744738.pdf
    • http://canvangdientu.com/images/file/wotitapigumijavil.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/fd12bf79eab307e20b2232dcfe85f438/xegawoxojejivoroxo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=menstruation+after+giving+birth
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e869.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE869 16792 bytes
font_01_sfnt_off00010080.bin
4386440567fc3a271bdfa0b59c6d48c228185fe20ed88cc8de7cc96dbab1e1a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10080 10744 bytes
font_02_sfnt_off00011938.bin
af69696ebc246bd9d0d15525b9e0608499cd18c30a8290014a7b46ceba4214ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x11938 16740 bytes