Malicious PDF — malware analysis report

Static analysis result for SHA-256 44aee3c16c3d6593…

MALICIOUS

PDF

94.6 KB Created: 2021-07-09 08:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 51fc6679948d793a6b8b1465b97a0999 SHA-1: 6c60fab43e8dbed9a00a7f01cd2c4c9da045d373 SHA-256: 44aee3c16c3d6593e2229312a2ed16128a5520e2a8d9cfdeb63c0dfe82360215
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and potentially disposable hosting. These links likely serve to redirect users to malicious content or phishing sites, aligning with a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/irhg7noqm4ef7sv78aa01gl73b/zejovo.pdf In PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/vudolusidew.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9gl33p1jkbq19leh9qobcdn96f/felen.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/ed60084ad5bfdcefcc2d9fa7001529d0/mivuzegu.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071290b83f97---10694923958.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/5386f0f97b82fd1901d2739891b4ab79/18545738613.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/8998342766.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3df915646---6325445219.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/20052636994.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/14de66e5b57f6dd45497a93c06efcd59/30858891347.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/82868418422.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/11629719718.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/sanofosifogajuvetujanani.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/13446334613.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/7354929610.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/l0263vd505cb8ksq5cbmqvn79o/3112479714.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106030911337325.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/setetokowevojesas.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/3381ac4629013c6f2e6df0d86e6b9fd4/nunelopevoxijurevozo.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608469847af9f---77332980677.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/77460561009.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/mafewojafufax.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/ab956702e6b3e51292daaa7c550796a8/wasufarafadulumiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=minecraft+vr+box+androidPDF 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_off00011022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11022 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12839 10556 bytes
SHA-256: ff57dd245d179ba8cb78b1994c16a7c548052e27d708b216597cae803da8d4c6
font_02_sfnt_off0001407a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1407A 17284 bytes
SHA-256: 8b4efa1d3d976e634264b9b718d2b594a62d7ea3602fd0b7fed7a2cdeae6c805