Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab2635a06919e042…

MALICIOUS

PDF

74.9 KB Created: 2021-09-15 15:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 95843641a4dada5844f99c0bbf16b573 SHA-1: 4d8e2a102a0185537d09e3b150a0ae4bb9483323 SHA-256: ab2635a06919e0427c04db8aefd2b380732230ea7197da8ab3cbc5b3d291527d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. The presence of multiple external URIs and link farm heuristics supports the classification as a malicious link distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://pistant.ru/uplcv?utm_term=watch+floyd+mayweather+vs+logan+paul+free PDF link annotation
    • http://xn--tnqz8hz5cb8l.com/upload/files/pajukogowo.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/77284178532.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/47563004581.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/84357739081.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/nopusosogax.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/69211945989.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/giwuvunudazobifovovo.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161374101804a9---77661124504.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/mesupakudasa.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/93122928175.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/xowodewowodot.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/zetefatodi.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/21888106757.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/399bcbbfbce39d293c9494c11da11bce/xokovavel.pdfIn PDF document text
    • http://caramelitos.sk/files/59233308568.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///35092779340.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/sinunanejakalirire.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/76973213843.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/rupufazotadufawonesijali.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/93129167690.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/lejuzimibumakugenogixaj.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/baxadarenotixab.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161419e9e71050---62918044039.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_off0000be1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1E 17656 bytes
SHA-256: 3400be45780d852cb2ccbf9060f67733147363168de7e8c0cf4ee6d7027b692e
font_01_sfnt_off0000eba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BE 11336 bytes
SHA-256: 124185187612924a6394b8328385ea84c6951542917d56d3b68a09d684ef6842