Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cfd2390b0b5e9c4…

MALICIOUS

PDF

87.7 KB Created: 2021-06-29 07:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7cd743fe951b207ef7ef890a14ab014d SHA-1: 71307305990d45cc26b611248315c6dacf216328 SHA-256: 8cfd2390b0b5e9c44112161b5b8e9594f372cc1f264bb5652c6e4b3387975d42
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these external resources. No scripts were extracted, but the PDF structure and URL analysis point to exploitation of the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://garglob.ru/uplcv?utm_term=baseball+game+how+much+time
    • http://polymer-optix.de/userfiles/file/9711958132.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/e2164297be3646622963e77310254b5a/xudolorurepadev.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/bt2u32nmi5q8ge2akcic84eav3/vomujujewalasolotawi.pdf
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/41894514933.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba64892905e---bokagosam.pdf
    • https://avonsteel.com/UserFiles/file/5166869891.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/78a8bf3588ee9d52d8915a29ad62c0b4/34553971581.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed18fdd06d---ketafitupinog.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/dd37e1041d18ad36858a735ca51711ed/nuwig.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d7deb4293---33009104630.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/thhnvv71ui0vjnc631cej487d6/gumusademek.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7694a2506---35853330362.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a600ef56e50---58787530001.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5pks6rmpmmp1ogv5luvh70sccq/taxezulolarelufutawoda.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/imcvbcqqbp8a4599djkd6p02u4/39837422165.pdf
    • http://scandirent-new.ru/uploads/assets/file/mobawubegukovuwuxas.pdf
    • http://panziofabian.hu/fck_kepek/vovufixikiverusezarurawo.pdf
    • https://srldirect.com/ckfinder/userfiles/files/74796880908.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/9afcecc818ced591e0f607d271c00530/84448944169.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/ddkm4fdgi7p1h3mcdffhfdl4jr/fonemujavorajarilim.pdf
    • http://vanillasky-ch.com/images/files/tetemedukibama.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/ff7a003a54740b4cf950b5ee54b945a6/71252658041.pdf
    • https://securitydm.rs/slicice/file/78661295432.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/485c24ee436c0487b289bf56309de259/45791464760.pdf
    • http://sattamatkapatti.com/userfiles/file/lopukerej.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919e8352530---zudev.pdf
    • 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_off0000f484.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF484 16792 bytes
font_01_sfnt_off00010c9b.bin
3385f0ac3d714e6a3e0ac1958a7b809248de50adab5c54c3af6816cfcb73ed77
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9B 10852 bytes
font_02_sfnt_off000125d0.bin
ec2a0abd0a040b15962157df28a2fe73ecad6bc834e17924165dcd0ff9626cb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125D0 16940 bytes