Malicious PDF — malware analysis report

Static analysis result for SHA-256 a661239451c293a4…

MALICIOUS

PDF

76.1 KB Created: 2021-09-06 11:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f25bbb2966ef5d78b3fa9a4b51c0ebf3 SHA-1: d08f3a72533bd71612713b4c87d47efdc482d49d SHA-256: a661239451c293a4e429be9149633f090252bdae0bd369287d9df9a4ca5902e6
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://hoangminhceramics.com/app/webroot/uploads/files/75150532268.pdf In PDF document text
    • https://cargobull.cz/res/file/duxoxeriwirefisazujedafap.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/6c4bb796320b0a6d1677917456eb2af6/titoximakegaze.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/gejanejujalureweboliz.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609669b459d15---fowavufumuvokuborixive.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/fugeju.pdfIn PDF document text
    • http://poiskvod.ru/images/file/titatowamokakizunedur.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/25831236157.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba03cdb3afb---lopesajudogedet.pdfIn PDF document text
    • http://concurs-euclid.ro/upload/fck/23916683344.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/batanelujujajawarobe.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51882815879.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608616fee5480---72833331140.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607137c73f490---tumemebuje.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/91846258310.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/wafojapuzuzir.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/zemen.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802687815c5---wasagixi.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/71848333854.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae079b5b3d8---36714440027.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/fikivosatevok.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/36389795243.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5d30d8472---71253111309.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/34884536192.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/lc0r3c9r963u8h4e8h5rg1i0h4/73252847082.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078e8e750da3---soxusowupejid.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/ee45eb0a0c8e2317b617badd53d91cac/74904600979.pdfIn PDF document text
    • http://ore-processing.ru/d/files/91344442427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=angularjs+pdf+tutorialPDF 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_off0000c0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CF 10752 bytes
SHA-256: 0048c0abfd53eceaf480ff9849fd42b77e0cb38a07cd96f6b3466af74dc232e3
font_01_sfnt_off0000d972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD972 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 18652 bytes
SHA-256: da87c3cec18c6bd919b8a1fd453979b784cfd98e873ebc21c1755d3eb10fa4e6