Malicious PDF — malware analysis report

Static analysis result for SHA-256 be40397a8044a845…

MALICIOUS

PDF

82.8 KB Created: 2021-09-14 06:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7ded7478755bed01d1bcd2bf53f47f5a SHA-1: 7ce5bd268aa537d6ed751373af60a6ce6b1aae67 SHA-256: be40397a8044a845a2c51efb90a0e8dd0b15fb94db6a436f5a7b7fd589930b13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly indicate it's part of a phishing campaign, likely attempting to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7bc1a6096---23170633562.pdf In PDF document text
    • http://mcutech.net/files/fevinikitimonekezut.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/497d8159571f5abfebafacfeaf2e8642/38703841239.pdfIn PDF document text
    • https://dptech.vn/uploads/files/32755722622.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/81016244610.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fenudukatozezutidazovar.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/zobekofojuxazijif.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/42519696561.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/d92d64a02efa0e389d89d10bd3e0a35a/65161317443.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210902_FF48FDC3F0088DE6.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/25070861043.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/45299141608.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/19693418674.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/wedatakejoteje.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/selofidosewuvunurev.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/pokogukegirasuxanikukesix.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/wasaguzevofugetakazotasuv.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/39096019409.pdfIn PDF document text
    • http://iccarrentals.com/files/file/80539907458.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/nifowiwarufitog.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/71858723021.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/rijunuxetopep.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/vepexodoposamamipe.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/44373230962.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=tom+and+jerry+night+before+christmas+full+episodePDF 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_off0000da50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA50 18364 bytes
SHA-256: d0f521bc9b0986c45f78adc69594f0a3afc399acb2b34ff599b9bd45d023fcf1
font_01_sfnt_off00010a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12220 11512 bytes
SHA-256: 452ec696a3be3b01e75e3a99c4b8b196ebe87b2207b8736018e48fa1630b0dc5