Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b7c202fef4309b…

MALICIOUS

PDF

87.7 KB Created: 2021-07-13 19:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b3f626a6a21a74c3e4ccc68db54da4d SHA-1: 4074f27c1582b1e82711cfa1221c2718f8deaea0 SHA-256: f8b7c202fef4309bcce77c1a7f36ac4784bb52c0507daf3a9e71dc106cea9d99
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting. These links are likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/k1ijsrv07u1g9o09r0lgfcn933/36779431231.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d20715f6f---tixudugapekofik.pdf
    • http://sivam.pl/files/file/92517213281.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/e390f1fab15a4eb447085e9c1c262177/87070758639.pdf
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/77e3efcc4d490f5a259e38d13e1800de/beregokiterazesuj.pdf
    • https://tavio.ru/files/file/47310987238.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/85a7530e7dc08e8973a15b97101e4afb/21651472786.pdf
    • http://hitecds.com/userfiles/file/90330307957.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/ba558f8040879fd7db1f20508d245f21/jevitujeposovozifomojalu.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/hn3sadeo34nar78b6rnifd15v6/2673878722.pdf
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/f9f827bac9aa64fa073e6ad522278c21/katifanam.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16099c7d10ace2---kutikumibiwedejeg.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/d1b5c654bc6e2ed1ed1c6e2ce8638429/xerozomomafuribabewa.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/af9f8dfddb147b6eeb39fb853c279e44/94368097475.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1cab8a8a2---80814177124.pdf
    • http://globeksa.com/ckfinder/userfiles/files/82074841523.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ad7d362a6---15133039235.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a3d5d5ecf---tujisoz.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f038c737d1---timadajo.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/d11088b8c0f5e3bd657e58a40a109c69/98236235288.pdf
    • https://heyratacademy.ir/file/98408105747.pdf
    • https://cdmsig2.com/ckfinder/userfiles/files/kameke.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/9867b1772a3cfc36bfe767d2dc86e75d/73181736506.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=before+and+after+clear+aligners
    • 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_off0000f3db.bin
c27d3be45f3b31e34e0c6c193b3adaf34f86c0235121f12470d2b84b9e900e20
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DB 17264 bytes
font_01_sfnt_off00012114.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12114 16792 bytes
font_02_sfnt_off0001392b.bin
9a66a8ed2027aa3901047448afe38bc71d84b52f03acf8be26e80b7c0be48e64
pdf-font-stream PDF embedded font (sfnt) at offset 0x1392B 10704 bytes