Malicious PDF — malware analysis report

Static analysis result for SHA-256 c043e0c7c7f3aa16…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 13:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2f04aa93970f8b334cf090741f3abf91 SHA-1: 5f00edb97921dec2991c5122a72776bf2dd5f0ed SHA-256: c043e0c7c7f3aa16a544a75d786a131a29ddab92fc6e5b1ae68b61ae488bec9f
176 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://krisoc.ru/uplcv?utm_term=capcut+app+new+version PDF link annotation
    • http://bdsps.org/slbdavbatala/userfiles/file/23661469068.pdfIn PDF document text
    • http://022-web.cn/uploadfile/file/20210913042212760.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210916_1B64E388B066B1E1.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/xusesi.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/josiwubaj.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/kinitajifo.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/rowumakadezevejupedu.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613faef4328d3---5184623980.pdfIn PDF document text
    • http://indel.sk/userfiles/file/34561123221.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/57729132018.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/79865108070.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/bovalagipeworofipota.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/26057729127.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613057b971651---zewalezamu.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/37195839573.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/7fe2c6b446c82db36d004c774062142f/93985613753.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/kurikiterozum.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/xudofe.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/simaxebuvonog.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/pamavuzadukonimikikiz.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/zetitinugagifa.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/33338252842.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/digugovejulifiluvomomilob.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/66859281664.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_off0000de76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE76 10604 bytes
SHA-256: 8dbbc93f65025eff413bda752212a440888ea5038d7671899931e3f29edd7d24
font_01_sfnt_off0000f6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EE 18944 bytes
SHA-256: 9a53ce4bde1dbee3e1222ce8444529b268d9eb57fd2d8ef89515738251b78b88
font_02_sfnt_off0001275e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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