Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fbda930c2ebd232…

MALICIOUS

PDF

81.8 KB Created: 2021-07-01 10:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: abd8b1c5daff18cb146970f9195f3eaf SHA-1: a898a6a0e108c3a6f0d8f4055a983241574ef6d7 SHA-256: 7fbda930c2ebd232a46d880a72ba6fd42527c03e02879419277dd0b76e7f3a01
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious destinations. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or malware distribution intent. No scripts were extracted, and the document body was unreadable, but the heuristic firings strongly suggest a malicious link aggregation strategy.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2691

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 https://inwebjor.ru/uplcv?utm_term=3+layer+architecture+of+dbms PDF link annotation
    • http://lubrifianti-auto.ro/files/file/sobotuvujowi.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/30930682896.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/bjrb958qc5emnn7u9qrdf3ci9l/satofovekuwese.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c73e3340944---88266942699.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab0f7e5be9---puzuduzimofedogalupiwu.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705efa50180---85273648928.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/8a566d546ae44a09563f34658d952016/53085055712.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/67543974830.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/fokolomexewogujeranoj.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085f6556b503---14848648499.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hg11thjqfa7glsg5r8vjgr88n2/22632441764.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/38918472185.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b331f77396---savevuwatomo.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/gvrlr42d2dr87s24a2ei31e4et/bobosopofubepekuvalelova.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/dedumuju.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/3d6d586d1d3544932b78db7b843aa729/wipupunijujupenepigosaruj.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0ea3bdc48---98857096892.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/57563276735.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/5392165cb197255cd61f61f6b7bd9ab6/60825248344.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/rupisekamaposinuve.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160718722446ef---13623530489.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/zezewoxosigenisurivone.pdfIn 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_off0000e6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF11 16280 bytes
SHA-256: 8aa8e43c1af80014fa396ba23ce9a57aa10a26ac4ba0cec53010bd2005956c26
font_02_sfnt_off000128c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C8 11064 bytes
SHA-256: f76df57dfc09432e794447e9038874a74dec49ab7bf6e4a4856e6428a12619d2

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