Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa65530bb2cd19da…

MALICIOUS

PDF

147.0 KB Created: 2021-07-03 11:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 16404625c8221cadf80f6283b6311862 SHA-1: 9dab9f7366506568d998197a62c10ad51128976a SHA-256: fa65530bb2cd19da16a4907f48ce4f359e6f6e0ab28b95362dd02ed874a736a8
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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 http://sieuthibds.net/images/files/namonamalobajipaluge.pdf In PDF document text
    • http://animalscipublisher.com/files/upfiles/file/zuvuvuratuge.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/7392943158.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/nf294utn9vd9rii2pkgeuppgst/23730587542.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fa7e345a6---11274830801.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/fe4a2300e2d654ff91098220207dbe89/25620707329.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/5c1cd50b2766f498443c79368ef4e642/wagivizekaxifuwolud.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/64227550710.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/ef6fae5bdb448558bd3ce53d60b1ab0e/luzigiv.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac47e9524ac---gisigebapugimufalovuteti.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8640a83ce---46254658949.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b84faf2031c---kijoxilevumigeposezaw.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/5f409631761f5fbd4a91def8b0ffd40d/terofakuroduxevapujana.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/36665483655.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/72253191548.pdfIn PDF document text
    • https://tonitomov.com/picture/file/46052924851.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b38668790d---dedafudafabofinivodeles.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/68300156253cc1bd30ab4eaedf938b01/widobobopeb.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/mosumajoregebotetolel.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/17345135303.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbaaecb643b---bisiwidumaxenowagisobu.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c729e8dc57c---navegupogi.pdfIn PDF document text
    • https://nadamasristorante.it/file/43936337427.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/vipupivalav.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/pakesibevaviv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=zechariah+angel+of+the+lordPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/510b81d95a583c8026555634dec212a3/tujenufigalafovagutu.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_off0001e13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E13C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001f94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F94E 17312 bytes
SHA-256: a11359eb338ae37ead699f5ea418e985b42e539a730e4f4bb8683abf52a0fe20
font_02_sfnt_off0002267a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2267A 10552 bytes
SHA-256: d9981df2c7c41de2d442441d1f625547497c72c943c986aa5e46e05f47446a13