Malicious PDF — malware analysis report

Static analysis result for SHA-256 838ab5ae1cf495bf…

MALICIOUS

PDF

86.0 KB Created: 2021-06-27 00:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ece08d10e74305d070faa419e9626b0a SHA-1: 9731745020ecef5c242a4dc2db9fac8e9e6b4b85 SHA-256: 838ab5ae1cf495bfb975b1a9012f950fedd30cf13ad01284107159552a797d76
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads and disposable domains, designed to redirect users to other sites. The embedded URLs, while numerous, do not appear to be directly executable, but their nature as a link farm suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d57fd9dc52d---91192287236.pdf
    • http://porpora.biz/imagenes/imagenes_contenidos///31669478037.pdf
    • http://beliangka.com/contents//files/sobiwefadukutobelenuz.pdf
    • https://novahealthclinic.ca/userfiles/file/31899502578.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b74cea792bb---93810236873.pdf
    • http://retroldn.com/userfiles/file/gokil.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/96192ea269ac37e8eb5837d72b3871c7/buxufugupamuf.pdf
    • http://malbreil.com/userfiles/file/24007470890.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609464ab242cf---42335597103.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2533be6eb---sifiwozaxudotuv.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/aa3d094448eac6cf78fa1421deeaaa0b/18406789340.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace88a365e1---2017918136.pdf
    • http://www.derbysignandgraphics.com/uploads/file/44313820310.pdf
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/47415364965.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d7954c0ebcf---87515852985.pdf
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/9781314414.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/vskjp8h2eb15h043a8ltsjn56g/fazulojakiganito.pdf
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lopigalovozofoz.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090ab539fed8---tokoram.pdf
    • http://assushop.com/userfiles/assushop.com/file/dexivikamilemosogab.pdf
    • https://prtl.pl/userfiles/file/jimopetoludeviro.pdf
    • http://anhuifan.com/upload_fck/file/2021-4-28/20210428232236911385.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fad8e05b9---58973811088.pdf
    • https://simon-daulte.com/ckfinder/userfiles/files/pafizosivemel.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=whitetail+action+outfitters
    • 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_off0000eba6.bin
31b19529436e2ab4267c092e0caa7e2060f93d26b39a4213df9721fff47f066c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 10528 bytes
font_01_sfnt_off0001039a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1039A 16792 bytes
font_02_sfnt_off00011bac.bin
5bd7a25ca934c4f2b4f3a926cc368bd3541456e5bc05b8a6fcde1a49140a44c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAC 17384 bytes