Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8f3b615c42f8aa…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 14:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3adf39d91b4d014d1fe5ec2cd66b9a28 SHA-1: ab415228517128ab8f004c9dc38b805f999debac SHA-256: 9d8f3b615c42f8aa5966125100d1f3a95a072976b718ff9ef26a0088aa06054a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous URLs that form a link farm, many hosted on potentially compromised or disposable domains, suggesting a phishing or scam lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this. No scripts were extracted, but the overall structure points to a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=hacking+with+android+pdf
    • http://annabarons.lv/files/files/39051627510.pdf
    • https://soi.icami.mx/ckfinder/userfiles/files/84511499940.pdf
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/58402438016.pdf
    • https://fotofidelity.cz/userfiles/file/tupaluju.pdf
    • https://allegypttours.net/userfiles/files/sanaxalositejusi.pdf
    • https://hankilfood.com/userfiles/file/20210918204709.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16139cbaa746c0---49529023618.pdf
    • http://ghalemdi.com/userfiles/file/bevenuluwi.pdf
    • http://alwaysshine.com/fileimage/file/linikikomibolejeresi.pdf
    • http://mgrima.com/files/file/vevunaviv.pdf
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/wugedadagodoxuxawogifi.pdf
    • http://bellina.pl/userfiles/file/71991621745.pdf
    • http://rockhouseschool.com/rockhouse/uploads/files/xefomajibabajutopaf.pdf
    • http://dreamcatcherltd.com/userfiles/file/kederut.pdf
    • http://burelomdo.com/ckfinder/userfiles/files/37275000115.pdf
    • http://www.neoneofitou.com/ckfinder/userfiles/files/jojuzakomalodi.pdf
    • http://drsuthichai.com/userfiles/files/nojijonexavus.pdf
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/zirakukufezopas.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb8dbec108---gesesekibabirup.pdf
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/lelivot.pdf
    • https://boucherienabli.com/uploads/FCK_files/file/22653983972.pdf
    • http://peoplefoster.com/pliki/telukajibowipolox.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140485752dc2---bojexawaf.pdf
    • https://kaptenhoki.net/contents/files/dejodewusagunato.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF23 16792 bytes
font_01_sfnt_off0000f735.bin
1835f534447bb41a731f8e18693d2308c09ae5af009014eef0941f8f2307a8db
pdf-font-stream PDF embedded font (sfnt) at offset 0xF735 18076 bytes
font_02_sfnt_off00012677.bin
137212ddaeb59ed86254899e649091a06a1cf773792f6cdc8bce34319521a7a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12677 10720 bytes