Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d11b12bc3084b74…

MALICIOUS

PDF

104.9 KB Created: 2021-06-28 10:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c601fa49b232ed141c4b924123f9f91 SHA-1: 49d3d6d16bd2bd1b5b65c719123bc281e5d042de SHA-256: 3d11b12bc3084b7456579cc3e4d934496a61052d0be4839e9e84b8b8fe27ce68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to trick users into downloading further malicious content. The presence of external URIs and a link farm heuristic indicates a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • 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.
  • 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 http://anbao.vn/uploads/userfiles/file/kegibamoxifesej.pdf
    • http://duancanhotot.com/upload/files/lunenapuzolol.pdf
    • https://cakenepal.com/userfiles/file/telosotofusibojesite.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607132317bea1---60222196127.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/8hu9t8oprbiin9b0kentm0ji95/27201039932.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/9bb033d4ea3ca59169002b38518296d4/88186571808.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/4ibehe2fbm9igpfjtip8u6imco/lalomezefojelijo.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/cd82c9b259780c92cd17729fdc668437/17628079163.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d67f8f06645---vasezigowixizuno.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/nb61qk51bbqc5gh1rrl7kddub0/86644684425.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1fa31511d---fitiwasanetosudovuma.pdf
    • https://kovosluzba-praha.cz/res/file/37488348459.pdf
    • http://dejede.com/userfiles/file/26653896635.pdf
    • http://aceonlinementors.com/userfiles/file/jurovaluwiwefibimesuvepi.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/40ce4acc44487be1c9f6064aaa8527c0/mixir.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/07acb10ab1i5f0mfudo57ch112/15764203945.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcc0f925a1---42443881379.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d6999512b---kadazitek.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/3a1acd838718c146032c2474b8d2cf74/60076423126.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/lugvghdr0ve2epct99g72c06v3/xotojawi.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/m7qac1q5bbia6qgvcnh0s4c493/fedogetebaraf.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae538dc9956---liledonad.pdf
    • http://dalnoboy.org/data/filestorage/upload/files/85486578577.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/b6d490b31c36517c7572dba3eabdf94d/25114466234.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b9qj9ia2iaj32cqqd5ldfuoo13/534798478.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=swissy+saint+puppies+for+sale
    • 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_off0001380a.bin
b6d8a7faeabcd6795889ab02acad7bb41dbbd47f03c0e8848bd0017cd021c40f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1380A 17404 bytes
font_01_sfnt_off00016558.bin
6ec5dfba9a99e1b827eef71cb988b7c9396acad10045942dc3454947a5143040
pdf-font-stream PDF embedded font (sfnt) at offset 0x16558 10724 bytes
font_02_sfnt_off00017e2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17E2A 16792 bytes