Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf2c949259a60c1…

MALICIOUS

PDF

74.6 KB Created: 2021-08-31 02:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 51bbe22fd886609e4e9c1b2be9a8bbaf SHA-1: 577aa26da91e3fe88c79fb78b6b15ebb9832cde2 SHA-256: 0cf2c949259a60c13539f3943e7c1ac0dc33917c1e3606e398a6150147e13bdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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=meaning+of+irrigates PDF link annotation
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e31303e58d---boviwefakap.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d4edb551b---25227019809.pdfIn PDF document text
    • http://charivne.info/images/file/nakezerujumakedope.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e032dbfdab88fc75297dae4823711da7/sazebo.pdfIn PDF document text
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/paduka.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/12267765915.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da59c076857---tojajifese.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d5eb03c04---ziloje.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/1620809575429.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210808191307.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/u1v7lkihjserifrl8l3g0lgq20/besofebubekilolurufevun.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/fulupejalaxigi.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/37641264703.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/mimazututumebibuvimitoxi.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d390a450c5---kukirosikoboli.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/luxivisumazawaverozoj.pdfIn PDF document text
    • https://360mart.net/uploads/files/66694906575.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/foritodotidalukijiposox.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/zanivomemopoxuxotajuk.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/44571535485.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/radebovirifer.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/c73890a8c1a2fcd960c689f726c94982/vuzavura.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099c8795b404---38010535820.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADE 16368 bytes
SHA-256: 9c65c52c822902dca2dd5eb2fe4845b1664247ac35fe1eb895dd2df717cf4f54
font_02_sfnt_off00010449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10449 10336 bytes
SHA-256: c2c391b3c6c0db2613e48e8fae9d7f0b739de21844ef9be6e01bedcf512434a6

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