Malicious PDF — malware analysis report

Static analysis result for SHA-256 82dc1391a603f11b…

MALICIOUS

PDF

93.4 KB Created: 2021-07-18 10:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ee8b3673961238289fa7aa593e1c6fa5 SHA-1: 8aaf83f333ddc70abda85be80f567b2a6af49936 SHA-256: 82dc1391a603f11bba9e4590918606654d338d2676fa605c8e25c7d4d6a829e2
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://haciogullari.com/depo/sayfaresim/file/95622890579.pdf In PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/967vl4pckfaj1pjista7jer7gr/xetomun.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942c0f22629---72828668418.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/58140238062.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/lepovewajozadozaneniral.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ae5c1c2e---8880366438.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/zisiwidomavud.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b1b39b88d32c4d69ed211fe184f5acb5/rawokigamep.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/diviwigixujuv.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/40188004883.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/dubupovef.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/98174540191.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/81cc88c4558eee91d03a8348d2b11977/75121158849.pdfIn PDF document text
    • https://qnzar.com/files/nabutul.pdfIn PDF document text
    • http://planbmedia.hu/files/defetoragepizijowivub.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/ef7d300873b4263012b7f31295f12460/baruzeraworuzugetejapat.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/97sqfrnn7r5dgg267okclu281a/jidatuvovududemagipeput.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/tofomexijulos.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f5b9cdaa887738d265d807626fc3bbd1/mivujipamikeborev.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d1dabc64cf7---91281414226.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/k2mueuhubgdpb99qsldv2uc3v4/tavopagadajola.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/87099614164.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af44c6e75a0---71412453870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=rummy+500+3+playersPDF 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_off00010980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12197 10684 bytes
SHA-256: a3c914970f5bd3e445c6fd3f83c5e85ec9f3b73335a4938679c895557f5ffa64
font_02_sfnt_off00013a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A30 17680 bytes
SHA-256: 84dbe98459a281baa144db8acfa03e84b901a72bedcd2c782cdd98309621f2a3

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