Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9c74862fe8a8b1…

MALICIOUS

PDF

87.4 KB Created: 2021-07-22 14:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 09ace9ee99e984967bcf719d4245fe42 SHA-1: c8a15e938e2854f2428c2575bb7e6d184f0ab766 SHA-256: 8e9c74862fe8a8b1dd89e8fb8291c793bd27df1d2597c7d243b6b5a4b278e591
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure itself appears to be designed to host these links rather than present user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6e4d59094c5b627fb85b212f34482db0/wasobutupogaxuviv.pdf In PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/komediwirasakovatevor.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/pujewilupawuxipukusujud.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/sabisalilixefire.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b230708e4---35853148310.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b0bc53872---mesirulatosifilafi.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/42991343590.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d23f7ce7d6---xagepi.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b42d8f65---23470683302.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/dajovagowa.pdfIn PDF document text
    • http://absigorta.come/file/najadabosofiniweg.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608513cf7fb0a---kosowax.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/9825d4ec0170455d5efb2ebddd86c38e/xovofoz.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/73529102895.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/97094367203.pdfIn PDF document text
    • http://northcity.rs/slike/files/jusij.pdfIn PDF document text
    • http://dnepropress.net/files/file/rotedezarubikorozobig.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f97e406e7---redeb.pdfIn PDF document text
    • http://forumts.com/ckfinder/userfiles/files/kuxifupigogejoripebesajiw.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/nbf71fbqdtkdu4ssnjj7p1bqim/gugupox.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ecc0bb6f7b---54104163622.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d3c96f2f8---wivugunavopenasuz.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021052120480939.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f857870e3---41935413767.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/memizikojijafomo.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/dorikadosalafoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+better+manual+or+automatic+carPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0ac52dee77521273fbf97ad0ff997778/31307598121.pdfIn PDF document text
    • 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_off0000f3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0B 10728 bytes
SHA-256: c75ae8ff2cc12d9ca1ad650f72af6849e28c610054cddd95da7f5eb260ba4b0e
font_02_sfnt_off00012487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12487 16504 bytes
SHA-256: 38699be0c38156b263f4d00ae58268e26da12b686e74904733b1c6f8c3ad6a07