Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3a1cc0ffee1470…

MALICIOUS

PDF

85.3 KB Created: 2021-07-02 07:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4767766ce9c63a334e7e0094ccc0928d SHA-1: 5cfc8f261d9d5a28d08386be6383734824374fd8 SHA-256: ff3a1cc0ffee14707990077719cc334f309f42c935e4be2450bfcde6d06632d2
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It includes numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851ad5aedb9---mobagibozamek.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/7581aa1886af1eab83edba23856ae2ed/gadanuxava.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/b222908e1ff4f03320a70c2837fd8d69/86275935808.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094984b671a8---kinodogiwekezowofowapiji.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/64732401025.pdf
    • http://jarosi.hu/files/file/51316199524.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd118da7c7---65617688112.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/4d50lsdnie39df03hlcmeuf2b1/gezasuritilofozewogagimob.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608630705b813---88403251058.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d73dfecb77a---mabamoseperumudaviletig.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9b3bb1133---sewixiguxar.pdf
    • https://mvpartners.be/images/uploadedimages/file/35246514619.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddc4b451b8---63631108875.pdf
    • https://imad0c0.com/js/ckfinder/userfiles/files/wijuvugulebefimave.pdf
    • http://esoftland.com/userfiles/file/gonunukixugorumufuwedi.pdf
    • http://almar-bus.pl/userfiles/file/nedupegonadojem.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160780425f3b01---43689935702.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/6177d1e160e52f135f1a876d4a4cb5bc/watavuguvitowofavidup.pdf
    • http://vhktn.at/images/content/files/xibibusemitaguwulobe.pdf
    • https://nikoljski.com/ckfinder/userfiles/files/direfatameb.pdf
    • http://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/d67d7ddaa22984201e1df560dcb21343/todedodivotefexagune.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c858dc3a78---903796741.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080f8a11bdf3---dawokefanuxur.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=adopting+a+2+year+old+cat
    • 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_off0000e925.bin
5b4c53287b5c8db24b7235a50446b55f9ff30f1f9373b2a207d3a1a4c2602fcf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE925 10736 bytes
font_01_sfnt_off000101ce.bin
40e3751021869bcde7b662890101498fc9a4153d178883aef3b38a85c6d976c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 17636 bytes
font_02_sfnt_off00012ff0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF0 16792 bytes