Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a16fb697bcd605…

MALICIOUS

PDF

93.4 KB Created: 2021-06-27 15:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 39585c2c3a66834951f9d8840620e0f7 SHA-1: 36932690e722ea950af467056857b7ffcc5c82a0 SHA-256: 10a16fb697bcd605dcf0be0e35e581a53300e71a391945eda606a1d8f68e4900
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to obscure the true malicious destination. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, likely for a scam. While no scripts were directly extracted, the presence of external links and the nature of the heuristics point towards a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://shethof.ch/cgi-bin/dynamisch/file/16525780631.pdf In PDF document text
    • https://alternativecarrepair.com/userfiles/file/mojizutamerodewagifop.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077685513de5---58375348672.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aada4ea7177---kukolibuxuge.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d364d4b94df---fagiwojem.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc66ec26278---66227407746.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9349579075.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b899554e---19218550921.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5eedd1951a---vipadubivolovajepure.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853ab7113a6---35449375463.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608431f62a49f---novupuzamajuk.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/zuwugadililimowavepodiwe.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/kizalolawufefedo.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096893564b18---47687587259.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788bf499c7c---mivamusakixas.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/jokowomugatoxofexodebava.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/73165704662.pdfIn PDF document text
    • https://advik.net/userfiles/file/resufarubesebaxo.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/u779nm9k86qpam3uac629oo10g/26889882538.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/e8rohj0guru49c8tkvo59q71qs/ruxotekumileta.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/39945698071.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/14303158518.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/nupedagajo.pdfIn PDF document text
    • http://indel.sk/userfiles/file/62194908895.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/51824555098.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b391bb02000---menofebotakaxujal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=letter+of+recommendation+for+communications+managerPDF 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_off00010c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001241a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241A 16684 bytes
SHA-256: e3d997ce4b2c8753d3e5fd4f264ff0d73af39cf9c4d8b5745a9160a9f0fbcbf8
font_02_sfnt_off00014f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F2B 10828 bytes
SHA-256: 0015301456ea7acf9a33606295ab069f87e7fd912494812573695564dfa5c420

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