Malicious PDF — malware analysis report

Static analysis result for SHA-256 315f33f067ab9fab…

MALICIOUS

PDF

87.7 KB Created: 2021-06-27 19:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ed1348fef4c443dfdd869881cea8377 SHA-1: d1df1f8127f52a33db597de5e25c38ec35f868cc SHA-256: 315f33f067ab9fab4d3db051e76b83125022524df1d345e36f38bd8aff7becac
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to prompt a callback, consistent with tech-support scams or phishing. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://infrive.ru/uplcv?utm_term=signs+your+heart+is+failing
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098665d607d8---bozusugemapirube.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/d49e8c9cd65920562d04cb1dba3e64db/dedojivamuzesiwejokureto.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f5719d02---neguzivugow.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607db49fc7d9e---likatawiragok.pdf
    • http://ahxxzx.com/userfiles/202104/file/3599398920.pdf
    • http://veterinariomauracotti.it/userfiles/files/xarodujenoxulodezixedig.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f364e9b0dc---45118458592.pdf
    • http://srsheicha.com/uploadfile/file/dumafukupuroxunaxurevig.pdf
    • https://binarbaid.com/public_html/userfiles/file/tikemetabikew.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/16a5037b61f9d3ef2c2188164dcf9856/domulifati.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/81ba0fd30ba03b922442be8b3b21c9b9/21814736952.pdf
    • http://megalabsrl.it/userfiles/files/bokonexubimitiwituzipoke.pdf
    • http://www.asslar.de/downloads/nedexojefogepovexejisug.pdf
    • http://amphorabeautyclub.com/campannas/file/20263914379.pdf
    • https://feng-shuiworld.com/userfiles/file/lanuxure.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d26fb25bf---33818911234.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/a1ee4b7ba7293a498109ca01f896c3bf/nekajinulavirokibaxuzeres.pdf
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/f815a156c770c41f284d5c39b4ba6436/vitarebepetofiregagibut.pdf
    • http://bilmatbasim.com/userfiles/file/45394874255.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdd9672678---xaxugebezinevaw.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b48869371bb---67635951869.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/b9pqbhfu85ka4g2giinecfe0ns/ruzatekafuzunu.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/4ffk2e1qifr0at8221u28pj4j0/weloseleditozela.pdf
    • http://mygiftltd.com/userfiles/file/22723789764.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ru0iop0s0l9nijdur8n3qe5t8k/66614880957.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aba7da5fff2---pezololowoxad.pdf
    • http://cascinamana.it/userfiles/file/66786077803.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_off0000f2e1.bin
880e0f73ae5ca0f390556a19bab0fb973105f7b14325ce67e0ad72062927c8b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 10780 bytes
font_01_sfnt_off00010ba8.bin
d2b73ff1a8d5ae7891f40b9563be21bb97fc8dc8c9a1e1ab889487eb4846ee45
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA8 17384 bytes
font_02_sfnt_off00013941.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13941 16792 bytes