Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d14412695479806…

MALICIOUS

PDF

84.8 KB Created: 2021-09-02 10:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1723daccd05d468b6daada6a09d4b0a2 SHA-1: 20090423031f618538d30331659c4d73b4c59340 SHA-256: 1d144126954798066322fc8ed23fec55a263376d664a7e8eab850f4459cafca5
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/70013683107.pdf In PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/86c69d081eb5c343c9b6fc289704a96b/repipasogexus.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/90196822653.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/15293689978.pdfIn PDF document text
    • https://naves.cz/res/file/87120881405.pdfIn PDF document text
    • http://ecotrans.vn/upload/userfiles/files/32380301081.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/welenedi.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/97765977457.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/4086090631.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/38683351957.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2c8002b63---lunejukasomanavagujukom.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/labedufalef.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/39477900.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/39256026709.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/04d36612a489cc33a4f0eb54d77fac9b/9670848288.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d0928278ff7---36379764245.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/82885729281.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/dokixefovevuku.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/fitewep.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/73231623669.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40fb9c1a16---tapeta.pdfIn PDF document text
    • http://e-hematologica.com/users//file/74907193591.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/84573504480.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=spelling+test+template+10+wordsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE383 11068 bytes
SHA-256: 8249dc73d3884914d17a108acf5f89e7431ce5e766aaa9661f106ae23a226ccd
font_01_sfnt_off0000fd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD24 18528 bytes
SHA-256: cddf25c5c2e4e5b57c2a7e78e151dc0cf7b813f632dca181fadc99b2c6898960
font_02_sfnt_off00012d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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