Malicious PDF — malware analysis report

Static analysis result for SHA-256 91196c17d5c7e528…

MALICIOUS

PDF

92.4 KB Created: 2021-07-12 22:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 643ea1d1d36cfe36841ccff9ec7b16cc SHA-1: 181b3caaedc0ed771eed252835d5ab7ec85a7936 SHA-256: 91196c17d5c7e5281a85ea4f3a9e069702b778ad45ae22be1918b405490378c3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext, further supported by the ML classifier and ClamAV detection. No scripts were extracted, but the primary attack vector appears to be user interaction with the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bevillelecomte.ovh/ckfinder/userfiles/files/51824681615.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/87r7om3dup3oiipd6g6fer0023/fobajixivalakezumula.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982bab411c8---72418844181.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/cbiclg9bpff13bbvoo4ijp04bq/xarekipakovurakifatudim.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/92941edb2a0ae91be89115bb43a5df9e/10026175518.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/b73dc99bd7db0e21d43c00da74b842ad/86489830548.pdf
    • http://giasuthienphuc.com/Images_upload/files/98786272692.pdf
    • http://yossy.biz/userfiles/file/37469655140.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac63985234---71764841925.pdf
    • http://www.tamtrebinhminh.com/public/files/48836963740.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/0ae5965480a27c02711e087e470eb9a2/lafatob.pdf
    • https://zemiigori.com/uploads/file/40148528597.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/e342cf4d819a49db35977bb1d8451a2e/wutopo.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086897409fff---xasetijofabug.pdf
    • https://boyanbolyarski.com/userfiles/file/kebabumanazo.pdf
    • https://bawwabatrizq.com/userfiles/file/miguxokusojiwagilipe.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ac0ab0f256d7731f5cb2089fc8c3199d/laligedobavozatokemevi.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/428f574d2f6c67eb6694ba1fcd53e864/12079711377.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e57abedde54---vukekadivalulemefodigami.pdf
    • http://coronado1977.com/clients/54390/File/xikakutadonipiduto.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9511ca8b4063834c0414e2879e952d2b/mamegerekiwobane.pdf
    • http://xn--xhq021fvrwdth.com/d/files/58553046611.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae81b7c4174---84350898242.pdf
    • http://highgaincomposites.com/img/file/2021618184530.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090df8497633---25169552972.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=gk+mcq+questions+with+answers+pdf+download
    • 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_off0001040f.bin
4ff93c2f87c67a81658d03138789c6354a7b43458bb9b12c2f0d1e75df754b63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1040F 11348 bytes
font_01_sfnt_off00011e6f.bin
f68e5d7b9b84d70ccd3c3ae6a9b6ba9dea969c4d935b79fc2a18929839c57ab7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6F 17384 bytes
font_02_sfnt_off00014c2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C2A 16792 bytes

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