Malicious PDF — malware analysis report

Static analysis result for SHA-256 2992f6fe3e4fc181…

MALICIOUS

PDF

93.6 KB Created: 2021-07-21 06:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3496c22a6c6699f51af95d41797633a1 SHA-1: 52017e93f433168ab49f4a862687d25011a7bad3 SHA-256: 2992f6fe3e4fc181e14126055c1e0a69197dadc8c9e379450fedea86b12a9724
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by an ML classifier as malicious and contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam context, indicating the document's purpose is to trick users into visiting malicious sites. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 6

  • 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://studiostocchi.eu/userfiles/files/38111697386.pdf In PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/7vpsbto7rheg2n70607aar12m3/mevafufebino.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/26162171721.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/timifowupuvanutane.pdfIn PDF document text
    • https://mszukam.pl/dat//file/66943352616.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/4219449475.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e4090dca3---nefipuneroximejejowomew.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d373901456e---derikefunozal.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/4eb51ab22d79b20e6dab7ec1bcc339f2/58047298168.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/35357466135ade19e27c06a288f3032a/14497358172.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a797c121a79---5514790082.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/524b7126b97f42586af5495f038c771e/84349193304.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/9cff23c5d53da7e753dd1edd7c8a315e/36106387331.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/540lnkbdauhbsgsv2m484g934r/lapodunaw.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/19075875972.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/1407634749.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f8caeb18d---jinan.pdfIn PDF document text
    • https://menu2uplus.com/images/file/fejojubutesakurakixowo.pdfIn PDF document text
    • http://berbun.com/user_img/file/finasorilekisazafe.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727436ccf12---rokiwo.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609841ca14850---93936672745.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/e02e7bd911f2b39ce841d03fbee0021c/18853760739.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=latest+itunes+free+download+for+windows+10+64+bitPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 17972 bytes
SHA-256: 51948765f3c38759c7b6065a89634cd5118cd1e4d0c61cfd96dcfa55415b6cf8
font_01_sfnt_off00011ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE0 11048 bytes
SHA-256: cb13235dd6c6511d41abaa35e3d74d773a52e399653d78631058e360276c44e3
font_02_sfnt_off000138d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D7 16192 bytes
SHA-256: 97e3f73a58ccdd4784c9ae1678d9f90717e6b6d0c87c36bf93adb8865ef65ebd
font_03_sfnt_off00014e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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