Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a4fc00a6a3c56b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-23 09:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b48db00a021606b6f770c21c6fc53ba7 SHA-1: 14f17aac9d6d94ea3a924848581af2f651ba7be1 SHA-256: b8a4fc00a6a3c56bb1a0e0ed7311357d6bc18f8ec51ce1bcd443334f941cb538
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/cmqct4qdbmbaorje7vcte5sc9b/97877424439.pdf In PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/31508739989.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/telutugeminivozuvazenug.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/202027744.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/laferufezinasujumexo.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134234930223---27621451540.pdfIn PDF document text
    • http://naviway.su/upload/files/42618095122.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/dojaketimojajorugivi.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/7456514917.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/nakarakiwo.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/69030037698.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/fubesifugirifalulekogura.pdfIn PDF document text
    • http://houselandia.ru/files/geluzugokakekukod.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/14565882898.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/zufumex.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/bukeb.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/11811142814.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/57408416504.pdfIn PDF document text
    • https://noventa.cz/media/files/file/79635085122.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/vuxirolila.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/87302594259.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/zagedenawikusipote.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ab85d417e---gowonovibumu.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/tedoxe.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/ladiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=free+books+website+pdfPDF 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_off0000df28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73F 10472 bytes
SHA-256: acc6a6190ea079b01414c6878ff009586739be2c2b03b7670c3a274fca14c66c
font_02_sfnt_off00010f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F02 17712 bytes
SHA-256: 0b93ecfd9a7f9f801ad5d7d40a083ac3d13e5b17543629f1eb41167bb73e8492

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