Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d2e99458732ff0…

MALICIOUS

PDF

76.9 KB Created: 2021-09-07 00:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 98daa8672256e073a231855d13fd53c8 SHA-1: 3df7e5062c338db2f902dc9a3dbc2a83aa366df0 SHA-256: 20d2e99458732ff03200c5b904111086b5831387897c1aa144149f8bbc465c08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple compromised or disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to exploit vulnerabilities or redirect users to malicious content, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://kfnmdg.com/upfolder/e/files/20210601091110.pdf In PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/54522137087.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/b3616737d2791e4ea75aa7b422525301/wugamagapawugunawir.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/43429016242.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7576c9288---53242064093.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad0091a696---ridofugu.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/nemevigawuv.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/jutusowesipizutuvogat.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/38143916752.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/3c24d79781f2c58b2ebfbc77fb26cdd6/jivonojubuwep.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/9d49bbf6b8eae3dbd824a0dba2dd9eae/lanaselubonuv.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/79384865673.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/10477479409.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/33156667869.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/niwaziwewezutanefota.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c34f590a579---xumomigalipodep.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/65043011580.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/kawebomasikugexu.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/fsttckuhtpi662sdc78t3uu930/madifivekuromenopix.pdfIn PDF document text
    • https://tonycustomtailoring.com/nbloom/fckuploads/file/89786087103.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f18347b7d1c---kejelut.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/3l3rrvu4ap22ni46hjptc3alol/77547157345.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/21520893781.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e3231cb9f4---gemalexiwepumetanudasesup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=rowing+machine+workout+plan+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_off0000c82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE041 11220 bytes
SHA-256: d18173f44046d122c8aeb6b1c338435d133363fd4a34cf6636100e7248e347c2
font_02_sfnt_off0000fa2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2F 16940 bytes
SHA-256: 8fe29619d233b4df2fa3767fdb6ed7ba29b76fb65f09c972ba38ad4aa98f5655