Malicious PDF — malware analysis report

Static analysis result for SHA-256 01ac33fa072011ae…

MALICIOUS

PDF

74.7 KB Created: 2021-09-17 15:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bdfa9b09339f6438d6b9d066f6bb3fec SHA-1: f2edbf8faded023b0cbde6298b2f7b60a8d292ea SHA-256: 01ac33fa072011ae674d9231be60b582a1d57865cb84e1dc4783c739358597e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://npas.ru/pic/file/kifivepug.pdf In PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/58845584202.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/fipekimukirabes.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/2182418794.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/82910000742.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210914143738088.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161426911a45be---22324328526.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/muvukakanegurilezi.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210904010755_760752062.pdfIn PDF document text
    • http://belean.pl/userfiles/file/tevilodenef.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/sanubowowos.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/aqumif0n03tsfpus26d6qv0l21/lubolotida.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/87738099242.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/jujoledovibigebezazatuku.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/20464365626.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/81689329313.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210901file///39281214816.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/xerexar.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/44787825969.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/75757189661.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/bdbe037fabecb681166149513561345e/sasekupitiwawepalufi.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/rabozuviwepavavesajusoz.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/6571cf49e9e08149af0dd08e73b8b3c2/16933187981.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/89884357767.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1612f37257133b---34254982477.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/26711150372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=spanish+things+that+start+with+aPDF 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_off0000bed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED2 18352 bytes
SHA-256: 0a5fa5ed6bfdbf5f192bcc149684afb19fac9e18f585d163f5c36a273b5ecc4a
font_01_sfnt_off0000edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D6 10392 bytes
SHA-256: b9a2ad172c3f0b22a61e3d23925cf31dfdb82ed720cabef80a9b6fec3d61b100