Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc4a9934e479a35…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 13:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cc800b940013feea3bdd43c8b3d76717 SHA-1: d77337f7314571012a15227f6a102a7a0671d06a SHA-256: 5fc4a9934e479a359d9be4d4c6f1f5bb25865847e6464d9297e24deaa40c9dc2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised CMS upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://szabobuszberles.hu/files/files/93714412115.pdf In PDF document text
    • http://cl-metalparts.com/d/files/maturazevasepa.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614363623d89b---18699429621.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613190ac8c2dc---18503691137.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/105663f49843f4f3370b268002233860/57009133221.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/55533255612.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/13469021411.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/88774136436.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/kivowarawifux.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/68807733132.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/9560236466.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613441f44b003---27177418746.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/58781689242.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/69460777521.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/68131810816.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/30676765786.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/femasepofesalusozokilo.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/93099940465.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/kovozavavosufisuf.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/bejegewidosili.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/didasitutevoxitebuvomamo.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/refuvuwalosepefusixav.pdfIn PDF document text
    • http://inphilong.com/upload/files/bokifarajume.pdfIn PDF document text
    • https://isosklo.cz/uploads/10430325170.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-12/20210912030119464131.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+one+android+phonePDF 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_off0000e18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18A 17684 bytes
SHA-256: 2a5f9d3ed4c50b8e59a3292e482e575ddacbd61002eeba93e42acba74b5d4be2
font_01_sfnt_off00010fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB6 10140 bytes
SHA-256: 17c62996f43d667e62755d5128cbc43157e9d49e7b0a11f8c110d5f2566e61fa
font_02_sfnt_off00012630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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