Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4745b8d0d8062c2…

MALICIOUS

PDF

85.7 KB Created: 2021-06-25 23:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 007931c4df7b7518182b142710c0cdec SHA-1: f8e990ba51cfd279109273dd918eefe5af21b126 SHA-256: b4745b8d0d8062c242ff3a7293e66dc087af1436eb21a6f8e89c06b4130b27c6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier. Static analysis revealed it is a PDF containing a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting. These links are likely intended to redirect users to malicious content, fitting the pattern of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/3c6t90qk354dp1ntj2rnll74sd/57808273580.pdf
    • http://lawrence-spruill.com/clients/42275/File/75394869965.pdf
    • http://csc0451.com/userfiles/file/20210621043548_wug1uv.pdf
    • https://cambodiadriverservice.com/userfiles/file/xuwiwenafofiz.pdf
    • https://motelandratecuci.ro/userfiles/file/92779918267.pdf
    • http://domplus.su/userfiles/files/wexogubuzojodiboz.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5427010ef---70996353540.pdf
    • http://sy-smile.com/upload/files/rofedugekurisujeza.pdf
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/32476779904.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe3e3657d4---93631222964.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/4qcqm2d73knrqd9im29jcepqbe/60970298529.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8a4e2a60c---68750445313.pdf
    • http://sskj.pl/userfiles/file/setoxidakigaretipanomi.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8935ada2a1e9e330aa9cb90b255d9661/jixeka.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79ff0d6ed1---toviruvedewurukekojijef.pdf
    • http://deccanquest.com/konadnew/userfiles/file/44246690268.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/88054939348.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8d40ddde6---5647223161.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1seh78949slm2hioiguutg8m0e/1598526090.pdf
    • http://itfind.ru/uploads/file/laluderixavotevibi.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a704c6058ae---95044402242.pdf
    • http://hyperasp.net/userfiles/file/femiwidedupoxov.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/befupusurum.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=macros+for+leaning+out
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0F 16792 bytes
font_01_sfnt_off00010426.bin
5d0b92a5d2a341e830a1aabea5de39fbf85fe62821f219f9fbf06621d6131d8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10426 10604 bytes
font_02_sfnt_off00011c85.bin
f7661bd797a65bddd6b015a49cce3477432f738f518846a8fcbd9a63c7c46ff6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C85 17236 bytes