Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb032759c62c2738…

MALICIOUS

PDF

87.9 KB Created: 2021-08-05 12:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b452963c3981488ac96405a8b11fd2e7 SHA-1: 5ea87e395c9b87f2e0ce22f6e683af957a36fce9 SHA-256: bb032759c62c2738b8a3fd58411a1a8e3775a460059058326f346427f5d19336
172 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 contains embedded JavaScript and a large number of external links, many pointing to compromised CMS uploads, suggesting it's designed to host or redirect to malicious payloads. The presence of a download button lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=yoga+book+in+gujarati+pdf+free+download PDF link annotation
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/2debffce61d3a6ab2b5c6a51d90258bb/tuduwuvutagonoloxivud.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/fogiwezamupen.pdfIn PDF document text
    • http://usmleworkout.com/files/file/76679725028.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/fiwiliveles.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9ced5920e8b3e35c993dc0300aa4c7a8/witovixugisafibijukobu.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba885e25da0---2882462078.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd99a87344f---weralofetubefosaja.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081684cc46c0---kigodiligedo.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/lamap.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac41645e61b---90901011316.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/fr8blltj1bs8mqvt9pv8jl0bpo/23351430146.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/30266528399.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/93e194d51f4dca7010d607523a1e2a4c/37068921203.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/bp6dvcn81vrc7n0hf45jvu7k96/93920106091.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8323a322e---fuzevejobunirexorirenu.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad7867e421---33407105106.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/91613601968.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/97851757725.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/2d927e73b2eb65c6811dcdd7e1afa06c/zizomotub.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/lemarenadazuzipi.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/60901229137.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb01d687741---mobemugagipapa.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/wujixorilawikivixupupa.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/8387917769.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/xejoj.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/72472371428.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/zevigodomenulip.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/b61fbc6413fdcac950741c2124e4e6b1/gigem.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_off0000f24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24F 11036 bytes
SHA-256: 0b2f6a5211da2c0b34ae2cb4a1f951e9ffa4869a4d009464ef7286fb65a60846
font_01_sfnt_off00010bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB1 17656 bytes
SHA-256: 455b026e6965aac553217d912bffe5fbc45246a9365efd75740642e633840f1f
font_02_sfnt_off00013956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13956 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1