Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c38e8ad64acfa0…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 05:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 181319f4dbea035a0de47eaf03f732b4 SHA-1: 09271836159cb3817a3fd48efa583302ef45ef1f SHA-256: 15c38e8ad64acfa0e2859c958449356b5bef661a0f89feba4e002bc3655cb863
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The file's structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/7pu5apkt851h6idpr58ldjfu43/kekavowadumubidedes.pdf In PDF document text
    • http://fipjp.com/userfiles/file/mejikegeru.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/lafewuzup.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd24142b934---7504806025.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071dbce7c6ea---84540713090.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdf5ec2907---52455127502.pdfIn PDF document text
    • https://cakkue.com/contents//files/47810321524.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1914da4ae---98278506047.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/73156246528.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/naporozamaxufavafefaw.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/450d10d7e466f0ef00373977c8e9e8cb/tukegokovibowatesawor.pdfIn PDF document text
    • https://dm288.rs/slicice/file/donetuluwifiroxase.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/dhth91f5aoigm9lvi9pl9uuvbl/dikatujegidajopiji.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/78b3184b11f230d51047728f2009b269/puvajonilevodegiwovamipi.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/15363704301.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b39c6f688c0---wubopakojifusowofu.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/sobeponomazivito.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/0c3ce669aa7841157da74bba7396e6b9/zewamakuwevakilelege.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/4qtev0qjc53agd1lkks3aof4ga/97148449690.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/14295731282.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/fubeturomodagejet.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/42945533113.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b0d509adb---60747719754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=pdf+dc+dutta+obstetricsPDF 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_off0000e1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A5 10560 bytes
SHA-256: 90b2b9b3cb7f147548be322c9ca6fd6473c6118dc505a0fcdfa2a459c18d3f2d
font_01_sfnt_off0000f9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FA 17288 bytes
SHA-256: 5e2ce3a69f3336df01ec7ad3fa0233dca3ca34c78207d384390e773ceb38e03a

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