Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec54fece0f1f45c…

MALICIOUS

PDF

92.3 KB Created: 2021-07-24 08:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 90fbbe6084b179e12d6691f55e7b8561 SHA-1: b64b44a74432d0d4dd10a6f23ab08f5bb2db7ecb SHA-256: dec54fece0f1f45cd6d661a5f53dd229d809bc80086469891ce051e850a6e972
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://cateringkieuan.com/uploads/userfiles/file/zuvukurujigivin.pdf In PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/s6d7fr7chmelas0d2o16s2oc3j/88611825666.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/66ig0u6u8p4t46g0o0273qla4f/67827999322.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1fb1d513a---61223741662.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6b1eede91---89857328119.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/nitin.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1d2931edc---71941375687.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608937efe1069---65914946727.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/7eacf70e43848f51e33792dc356e65ac/22307879282.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/teperudubinosa.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/63814570830.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe50153ae4---xudabisogaxezoxiwiz.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/83864170990.pdfIn PDF document text
    • http://praguetransfer.com/files/file/60313740928.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/dabelezodix.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/lisoxuxagatiwuzuvilomebe.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/zufedakefonubilitifinoz.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/repabuxepogoxunomosinex.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/d93d9235022e7f0fe5454378833c2874/juweluj.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/de347142a90a0d6bedf2f88ba61700ff/deroduwisisepanoge.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/m6hegctmdk6hfmq0gk79r8jkh5/nugudavaragufem.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/ce3ff69c63617683ff5f4a3b6a689917/69437437689.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/damatug.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/8af452c8c3922ed6b4a2173e5043eadd/kofexixenerejivixiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=target+setting+template+for+studentsPDF 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_off000105d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D6 16728 bytes
SHA-256: acf0826b613cf28f4dfa3b5e4dcddfefbf22519d4c31796135e069e35b77fda1
font_01_sfnt_off0001315f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315F 10904 bytes
SHA-256: 0ee32f720ed08d00434974200eb2298703b0ed305b497a7d582fdfd43929167e
font_02_sfnt_off00014a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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