Malicious PDF — malware analysis report

Static analysis result for SHA-256 e54edd8740d58426…

MALICIOUS

PDF

87.3 KB Created: 2021-07-02 10:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 361b9992db2dfcd1c344202244cb2a1f SHA-1: 25c53deab2c4114be4e58b0bba26982c8a29c9ae SHA-256: e54edd8740d584265b0528cc8158960880cfdee4d91c94212b26e162e94f6232
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, directing users to numerous compromised WordPress sites and other domains, likely for phishing or malware distribution. The presence of external URIs and link farms on disposable hosting suggests a deliberate attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=stock+trading+stop+limit PDF link annotation
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceec3605dd---fijek.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7ca3a4734---banim.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092dbd5dddbb---48333363045.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/36e1f292e7e6cb33358f8ebd92f0760c/pugurovubogukeke.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-23/20210523033501223408.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc963c82abc---45632414066.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/72441929528.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/a4aa484b458f1ac0aa3cc12af38cddf0/22750276136.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/35206413527.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/lixakovameragotuse.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/gidufavugol.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/96003985946.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16073ebac248f7---kivoriwaguvewevadijivoxav.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d8648fb37---6322617792.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/ed67fa45d54aac01abc177e0b28a25b2/kipazapibetelibameba.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/gawoboj.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/33665952045.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/7fcdcb6787d43c5527620c8e5971fe1f/fozegakutulufaj.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0fc823ceb---tezefibabiku.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/55808228459.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/89353282528.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/6afe38d34cccb72152ed093bb0ab9e13/tavujujudizuzerazedumifa.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ic7evde3fkv4t2p0jndn1n9gl1/37089897984.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/kowap.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_off0000f039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF039 17832 bytes
SHA-256: 65dda0160482f4395fb7763a2a7ca601df67ce5b58fac80ef961a0261ba85011
font_01_sfnt_off00011f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F20 10892 bytes
SHA-256: 6cf46c80a9f356069bb1c6e14783d57ba26dc142eaaab3c87579a7ad1b0b96e5
font_02_sfnt_off00013812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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