Malicious PDF — malware analysis report

Static analysis result for SHA-256 9685b62a158bde34…

MALICIOUS

PDF

81.4 KB Created: 2021-09-12 10:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e9df98358d2a2c2bbd2afe706835d485 SHA-1: 11ea2d15ca8f11aac6e79420098e0cc806084f5a SHA-256: 9685b62a158bde3478fa37b3eccecf9a7ebf4bbabbfc39e97eea21a8747f3e8a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to domains flagged as link farms or hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, but the link farm heuristic and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://bxbrdh.marketsearching.com/upload/files/30689995524.pdf In PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/vasodoxegilufis.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/jowovepikaxunebav.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/mipumemu.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/70933284335.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/vusejisujewodixuginapu.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/56d0ad3387b3f2379f3323b9bd3c3ba5.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/tiwepitowefo.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/12566750741.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/fotom.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210904/file/bikadewunezabadobakosu.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/98892767446.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/35063912773.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/wililuxevumazemudewima.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/24578811312.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16132ec4c5ccd0---67955373505.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ghplcgmhl6d75n6hmjkv41fott/21125682632.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/nonuzizaxipegi.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/54720998790.pdfIn PDF document text
    • https://motoralbini.it/files/file/sagapulas.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/dudis.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/4944f4df9b9a4b7cc8188acf244d4b5e/texovogalibomexo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138510bc45b2---zelufaxupufisuwemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+run+multiple+instances+of+same+appPDF 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_off0000d578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD578 10864 bytes
SHA-256: 0f834ecaa9fbc927e228b87f480a731198eec146267d64714a1a4150376d0d24
font_01_sfnt_off0000ee8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8F 19116 bytes
SHA-256: cbb2593e9efab1cdb608bf9cbcba6893c5938485ff937feda299cc438623223f
font_02_sfnt_off00011f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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