Malicious PDF — malware analysis report

Static analysis result for SHA-256 420637916a83be17…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 10:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 16324c94d1a8beaf8f4466efde03e3cb SHA-1: 289bab3a2f5a340d61a661e7517eb56b5fed0732 SHA-256: 420637916a83be17d87c55d5505b650394d4017aabbcea778e2db78a1a583868
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The presence of 'utm_term' parameters in some URLs further supports the idea that these links are intended to direct users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://smidgel.ru/uplcv?utm_term=software+engineering+question+answer+pdf PDF link annotation
    • http://l-max.ru/userfiles/file/lofoladenet.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/31820908446.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612044d1da0a6---44772728630.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c46ae3d3ae---zajugunizijapiwarawugugup.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6ce2f0f68---sedazake.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/kojitulefososaxasanevok.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97c8ebbab7---41501526294.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5fb6a3949d61b14a8226db41678e8139/mawuwowo.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/b6c48febcf3f692644c2069e1ef0ffce/40001333728.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pufitewizowovoxozupijuke.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/livizimiwifabifef.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/72034799377.pdfIn PDF document text
    • https://datajournonepal.org/files/10472578267.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072814c22b65---79308283118.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/604527ab0c45299ba764fdc76d947520/67177973104.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/dujesavoxuv.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/xajunexexesoxaweperubik.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/6d9f2eca67578f62d2f5d52c79f32a3d/84590441961.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9833c08ae---komidifumetod.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612aa7bd26ed6---90273100043.pdfIn PDF document text
    • http://dongphat.net/upload/files/25400715554.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/73218772932.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021716127264349.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_off0000ddcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E1 17376 bytes
SHA-256: c2d2a2ba3c9fe713ed9ce596f53f6fa47a2fa5434ce28470f9d0eb322a0428ca
font_02_sfnt_off000122f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F8 11036 bytes
SHA-256: dca0b7c31678fd08ec7f6810a3f03447bcb2f5b10a33564436ad3fb2a7e31940

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