Malicious PDF — malware analysis report

Static analysis result for SHA-256 d744d3f1a2df2564…

MALICIOUS

PDF

87.4 KB Created: 2021-09-02 06:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ee82711ad0883c595cf5a78efc332792 SHA-1: ecb8b9ce9817ae4a1a438be6af566e31ddd5a011 SHA-256: d744d3f1a2df2564b1ceee6ef6b65870949a39ef3bdb0effad8379ac9db6613d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a link farm pointing to compromised WordPress upload directories, suggesting it's part of a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://cukierniabrzezinski.pl/www/artizam/fck/file/pulekukiz.pdf In PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b2f6a48ae9e05d6cd96402840fcfc399/29699214606.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ce469edf39---jaforajojijij.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/37558996949.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/92346817271.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100afba691a8---roguroku.pdfIn PDF document text
    • http://108homed.com/userfiles/files/85629574252.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/tabanilixemanazatonugafo.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16107272449004---pikadexuw.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/piserimorizuwukapopa.pdfIn PDF document text
    • http://liberty67.com/clients/41815/File/5936335035.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/08d2164eea7746b136adde0d7f1316ad/pozuwukopolubatirelozox.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/22478771462.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/c5a26527cc3493e4fef3f2526a21346a/53362691425.pdfIn PDF document text
    • http://praguetransfer.com/files/file/29685936881.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/2faed509e9a7a4435900916fb6e8f550/vuliwudalofunes.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/jifabobik.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/wezogopimo.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/doxaradapi.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/44f95fa8f3537b5085be911e4c8e5eeb/66203132348.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/ninajilukotelixolema.pdfIn PDF document text
    • http://bienbao.org/uploads/files/maxetepizuduzomufeza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=sub+divisional+magistrate+office+near+mePDF link annotation
    • 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_off0000edbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBD 17912 bytes
SHA-256: 087ae64702e75d7a92806fb0ec7c86f6a6b79997fd6679ab5d039449b283a773
font_01_sfnt_off00011c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13451 11200 bytes
SHA-256: cc64eba6023b502a661c8154baeaaf971215742ed5e6b1bd7a663ab1055fb2f5

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