Malicious PDF — malware analysis report

Static analysis result for SHA-256 986cb17602f895e8…

MALICIOUS

PDF

78.7 KB Created: 2021-09-06 14:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6fec3c760af396acc569b49cdc9846cf SHA-1: aed930ce6f9d7d40f28c63c17aabf96934417345 SHA-256: 986cb17602f895e8a8f97d398e037f21158652df296014268d93a65b4bf2fe82
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely intended to lure users into downloading further malicious content or submitting sensitive information. The use of compromised CMS upload storage and disposable hosting for some links suggests an effort to obscure the true origin of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=fast+sketching+techniques+david+rankin+pdf PDF link annotation
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161142ba52b1e6---geloposabagovekile.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/16d85e85ffa7477d555049b3d9b3fb7f/10287516153.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/julabajufizuxesajuxelopef.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/fulepogalepolibuwesipuw.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/59204230500.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/9d5ffad02487f3ec9b8f0b67289b7732/8372217980.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/gifuweditugarixalob.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/00797899fda9843545b598a35016b57e/88618939673.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dc5bce629---51982241590.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/18674412964.pdfIn PDF document text
    • https://termoformat.md/img/files/72056077052.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/wafifejasifiwivuziwut.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/9tn5fqjj8s814vbs59rdc6tat2/moxuvolen.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/4827229156.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210723_BB3774C5289348B1.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/34293920235.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/64295115304.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/71110513090.pdfIn PDF document text
    • https://t2sc.me/userfiles/pevupunagaw.pdfIn PDF document text
    • http://master-vin.ru/files/file/luxefurajixidenuw.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160782170e4c0a---31134790608.pdfIn PDF document text
    • http://lyshiying.com/d/files/76157643552.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160908b2ad3733---xevaroxomofit.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/e176cd791eab24b451d43184a0793169/padisusalutokes.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_off0000cd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD22 17672 bytes
SHA-256: a3fbf9be036855041aa8a7498112772268bb3eb1f6210bc5943a833fff31d97b
font_01_sfnt_off0000fb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4B 11116 bytes
SHA-256: a5c7382dbc2530b5f7aa9b33aa6db45563ee028f27ec6f764e9745c22c4b7956
font_02_sfnt_off000114ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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