Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd8a8443ab194a0…

MALICIOUS

PDF

88.0 KB Created: 2021-06-26 03:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 718184b09661aae57cd7c86d0701e08e SHA-1: 47d078bec509903cdb14b0ed51d0463b9d2709f6 SHA-256: fdd8a8443ab194a0cd2c2de2c70d37cc3899b2ce77eeb1dd4b9dfb4b43ec7fae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS upload storage. While no scripts were directly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious or phishing content, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608427f23e601---64806342781.pdf
    • http://szyldkj.com/luodan/images/userfiles/file/nabet.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/117d401c65c3ff30632c87227ebfeeab/toxijupibumamivuxomas.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/c22441d0221cefb94a49c080287208fe/gepenonek.pdf
    • https://tepihtrava.rs//files/10403861172.pdf
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/r9i66co5eqe5a9sala2m8b7850/besidiroxodex.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/712eec9d6acbb890a11d1192357ad9bb/melelonarekatizod.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d61fae554---26136833545.pdf
    • http://arch-teh.com/pic/userfile/336767843.pdf
    • https://kurek-rowery.pl/user_pict/file/54921622222.pdf
    • http://palazzodiaz.com/userfiles/files/28540717580.pdf
    • http://everest-c.ru/ckfinder/userfiles/files/bibali.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/687205a105c1aba64a752f45d67256f0/xutesofapatu.pdf
    • https://masihpt1.com/contents//files/jenowiwedozuz.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/617d55a6880f6b83b2b2eaf0278151c7/solibaxisakilaziwajizef.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160795b0340be7---jilapijelopatunodevumafa.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160bfac223e31c---73681835125.pdf
    • http://ankurgroups.com/userfiles/file/11000992203.pdf
    • http://karat-dobremiasto.pl/userfiles/file/jawenuralekapebino.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/2d0ee3581cc95eb38661a6d0357cc146/89379062684.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/d1120b3cc3245d6ec924a1a1965e0c51/62115720800.pdf
    • http://easternsheep.by/app/upload/file/15458902821.pdf
    • http://tydafa.com/dafa/uploadfiles/20210610090526.pdf
    • https://lentes123.com/aym_image/files/25201346399.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf44d22392---14235199078.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=middlesex+family+and+probate+court
    • 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_off0000f182.bin
3a185a710adcae42eacc93ab56089c93e7d0a4e263c86d8c11a71c18f4f5f1cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF182 17744 bytes
font_01_sfnt_off0001203e.bin
9f862b75debb5aeda11866a1acade9468eb0da085d329df3e4ab4de2d64126ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x1203E 11228 bytes
font_02_sfnt_off00013a56.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A56 16792 bytes