Malicious PDF — malware analysis report

Static analysis result for SHA-256 309023f911f2a86d…

MALICIOUS

PDF

105.3 KB Created: 2021-07-14 07:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c6432fd93d13ca4c13f556511b978ba3 SHA-1: 133ceb3226f730ba7bb6456b1594486546f5d231 SHA-256: 309023f911f2a86d1022b852d7c17fbe55e8ca0f87cfd903bd667e9dc618f9a5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to phishing or malware-hosting pages. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/397da674fce4c7ad54665088aabab67a/38681477383.pdf In PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084fb8f16a64---37717266279.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/b2ve8qev1q0k5eqh13hn09ghb3/35883379870.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/pr4ks6bn7udu04pna93q6nohsa/67694725211.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/vuwixe.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/52038880139.pdfIn PDF document text
    • http://merwepizza.com/upload/file/35176386159.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/pomumalebafedifemizeje.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/sapikexa.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/43mv14u3no06q09914too0the3/78848473448.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/t1ifsnqki62uop70l6kv2ldmt4/12754870667.pdfIn PDF document text
    • http://air-ned.com/uploads/files/zevipotefexuloxekolog.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/55009527662.pdfIn PDF document text
    • https://fultoys.com/userfiles/fosipewug.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/62aa8581f8fc3c7807f956711def4b55/32505230273.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/fe960be7803c74c450ba93c390c9a116/35068238749.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/9592722917.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16098f1eb4cdfd---lewivapupupijudureropud.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/4ds7950sp5ulp6sl8mkm6009l5/gupesegewig.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfaf1eb8eb---53964271195.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e91590c051---77897561101.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e5baae3239a68247bee27cd54f7a4fa7/fibititu.pdfIn PDF document text
    • http://modern-pro.ru/files/file/22656464492.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/ca72377984ad945ee09ccde226804242/25214344321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=carrier+2100a+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_off00013540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13540 20992 bytes
SHA-256: 67aee7566e48c2de11c629f4ff06da3461c09f5d7a9b41f88a0560e27439afa0
font_01_sfnt_off0001677e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1677E 10308 bytes
SHA-256: 5e54b53f0fec9e76d42870e23b709610ce4e37b0a3e65b810eebc263654179fe
font_02_sfnt_off00017ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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