Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e05a5b552fd7af…

MALICIOUS

PDF

75.0 KB Created: 2021-09-06 01:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 1c1da5c3f9aa52705df155937041cd74 SHA-1: 1bc64520400debb93400707ab9156f485497f61a SHA-256: a6e05a5b552fd7af09a1ea19a4192cc60b492f637034df36acbee33ffc342ead
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The heuristic 'SE_CALLBACK_LURE' indicates the document may be designed to trick users into calling a fraudulent support number. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://drafthe.ru/uplcv?utm_term=deed+of+sale+sample+pdf PDF link annotation
    • http://langeline.com/ckeditor/upload/files/gadawulefejibajitem.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/37648404340.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160883973f0176---88204208719.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/83941819092.pdfIn PDF document text
    • http://fohow77.ru/upload/file/mevexopegokafuxovu.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/hf6lhd4pk855abk97gho6h1v05/jipikewe.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/2df39a3bf3c784c285e18b335d1c3157/79997665917.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/96746591527.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607f39bb4b2ec---96774947844.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/v832ihakf3gj3coorpn8o9pfl4/fijodokagukofez.pdfIn PDF document text
    • https://linker.tw/files/nokoxugan.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/waxifiwoparonafimarazumaj.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/kupobigimumofawugulobavu.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b12fba72d84---sojupaperidimek.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/fipokol.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/57604606057.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/05irrvlm9sk48dveagj1u9vkii/gexojelibikowimanafetelos.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/memegolotuso.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce499ad491---12548043614.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdc895931---jififadogidaredobarekaz.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/943e2e1d6ed7952d2c7e23512c2b3534/8806594699.pdfIn PDF document text
    • https://bursac.net/userfiles/file/24663204990.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161329b9d817ff---kusim.pdfIn PDF document text
    • http://geonatlife.es//ckfinder/userfiles/files/jixozusudutuluvibejunum.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/itigeporesij.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/51e045ielvrbm0kkh58sefnoae/wagudabezijomid.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_off0000c267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC267 17428 bytes
SHA-256: 9ab589c9b8652b9cefebfe2aabb6be666d306904a664c8a7b576b80c11451197
font_01_sfnt_off0000ef6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10781 10268 bytes
SHA-256: a647a6d12361bb6440b6bcaf933984a8d74f1b4de98271f30d76dd3d6c3099df

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