Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c4a4b61d9a609c8…

MALICIOUS

PDF

114.3 KB Created: 2021-09-04 20:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4dc0ca32b1cbc743f02c89aa1be644f0 SHA-1: d71eb35ae1c94bb29d9106dcf69d1eec56e4e7b9 SHA-256: 1c4a4b61d9a609c853aa142c4ef21ec6c50ef0898aff8cac6c858ff67b05dc1b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of external URIs and link farms indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://bjbtrh.com/files/pic/file/19592307619.pdf In PDF document text
    • https://organicfertilizerproduction.com/d/files/fapegatiguburefisidudod.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/mv04gr6dgmdshs46bqsv1da92o/1224678729.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612202cf341e6---638752176.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/ip3h5lai2mmnu5j3n3d3lk5sju/94861312871.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b70c56195b5---37757936505.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0g140o0lv22af5i1bcoggrlsc/rozerozujalugi.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/1f6278c878c006ccb600e3c08e1392e4/wemeda.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/694c4526256ea7c6feeec4c8a4c4e327/72662558290.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125a7b063a3d---xogigiloje.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/c514c5bb178395796ea83b39e860bd3d/67972215308.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/ginevemorajopigug.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0fc27c557947f61c70265367511cde2e/58356548665.pdfIn PDF document text
    • https://ambalatender.com/upload/files/74495352638.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c06170e8d9---40442712660.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1624409051.pdfIn PDF document text
    • https://ienter.bg/files/nerapumutava.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/pujafadosunisig.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/532f6bd4134cb48b6784de0420c6366e/nepepubezepot.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/3d89b075fbe976b5618b1618d8a065d9/68804603713.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/kewovalaxaditav.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/s6fjib6achaqj3r9b1hj8lftr1/nebejiwojiwamosopas.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/26481279982.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160747a9b9e784---kefafoxuxujakina.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/42945005175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=peoplesoft+nvision+training+manualPDF 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_off000159ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000171fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171FC 18300 bytes
SHA-256: b6355e95eec283235cc8de7394658d7cd27a6269c485b54bd1a19d2da31be837
font_02_sfnt_off0001a1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1FC 10868 bytes
SHA-256: 48f5fa338de3e0f63469f439b2adb92266c8df0970abe4d073bf32f505bec148

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