Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8b3f507ac9a715…

MALICIOUS

PDF

81.3 KB Created: 2021-06-26 01:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d35698bdddd6a1a02eafd5ba7537a98 SHA-1: 31676b1829570dfee568d9edd08b4559f66bd14d SHA-256: 7b8b3f507ac9a71595d4a9794fefe4ca477ac690132c5bf64e0794fe845ce2ed
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://messtores.ca/fck_user_files/file/97414526012.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/467895fc1f90c7860482419d9c0396de/64208178899.pdf
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/pasegiwitefudezeme.pdf
    • http://aarogyamedico.com/userfiles/file/59748961356.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080097a8763d---napawegazofagufa.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8cda8c9ea---37099375592.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d751e8423efccce689534daaebf25f41/67279332457.pdf
    • http://www.bluewhaleline.com/image/upload/File/zewasefi.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/38e9a0dd82fb53a0076f36025cc67ea4/53024848552.pdf
    • http://assessmentinsight.com/ckfinder/userfiles/files/16077279065.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/t9gtouef2jp5mcsapa1a0g70uj/gedagovu.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/0naho6o7qkmll4k7k55247lfpm/5784027955.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830733b6acf---70364218615.pdf
    • http://asfus.net/virgsurv/userfiles/file/54917863563.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608127c17197b---44096334982.pdf
    • https://smartmedia.ro/app/webroot/files/userfiles/files/pojobelazujefapafuj.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075d32dbf41b---ritofakul.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/oc2fckbspgtvtqmo8nolr848k1/fivepidikakagerolajisawi.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8bee10429293817d77b5d9edd77d5d6f/20785537033.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd7baaf02f---serene.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608191487589f---45678959879.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8ed39ac9---mojumevaduxupezizajesexa.pdf
    • http://www.hangmandigital.com/files/file/gulofunajaxunujuribewuso.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/9sjs4s3vvalr3v1dcvcppl3c5j/mezut.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=physical+chemistry+atkins+10th+edition+pdf
    • 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_off0000da68.bin
31ea91d25eeaddb0ea455cc7e9ecf5a73fa91c466737ae86a81626c4b4b101d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA68 11268 bytes
font_01_sfnt_off0000f4b8.bin
35965a796d4fa2364be75f1ef88d5e1a803c36044189d8d67700b7289d00bfff
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B8 16500 bytes
font_02_sfnt_off00011f9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9A 16792 bytes