Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ff376c0b18b8ee…

MALICIOUS

PDF

101.1 KB Created: 2021-08-17 07:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c5f72e6f35f465f2a07fdb9d63fd550f SHA-1: dd6144662e9552e49690125d82994257fb62b145 SHA-256: a9ff376c0b18b8eef12822cc686ae1d1201e4446e4fa0865e6dee9f3b342f04a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this file as malicious, indicating a high likelihood of phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the link farm structure is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a3e9582fd266f658180ef26aba2a7f2f/80061902060.pdf In PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/wigeduriretezanu.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ffu0bq7tkt46f0h8nlks87kvth/81655535889.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/80398668754.pdfIn PDF document text
    • http://htcable.cn/d/files/sofisibamuxefiveguvoxol.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/fa34965c3c9a17fef5d40c15f03befc0/liwurevenikota.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1610a5631283c3---zevutedev.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c88305c270b---60344703273.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/e1e1dd6df6bad8240c5747ad5b01347b/15599348545.pdfIn PDF document text
    • http://labsshop.com/d/files/xefijuvikajumi.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/8et5icaebs8q4t94hf7q6h5mp3/39713280304.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/08712ea186d9798deb565f5be1f430c7/4221040148.pdfIn PDF document text
    • http://pgnsualumni.com/clients/872691/File/57035060634.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/jubupevisilanibezep.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/kufepiwetinanikagum.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe2bef2db4---70493478752.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/bufitisozowamibu.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/mobipamur.pdfIn PDF document text
    • https://warungmimpishio2.com/contents//files/xovotorerusukojajon.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f268605608---nidiwowejemetemu.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/nomoduwanetonigaxebesu.pdfIn PDF document text
    • http://lebo1977.com/clients/7/7f/7f96701a3ad848a090446b6ea7dc17b1/File/lurexite.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/mawurezufafijogixizuva.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/49093ec8e689679487c18cf24b543d6c/10095956206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+find+n2+in+combined+gas+lawPDF 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_off00012163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12163 11056 bytes
SHA-256: a2c4d2b57ed20eab7028610e12e38f502400de2135147b6d7849f8d696621bd2
font_01_sfnt_off00013af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF9 18836 bytes
SHA-256: 5765535f88bf2562135eba69be74b38345962e5561947bfa8983bdaba9a04d78
font_02_sfnt_off00016c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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