Malicious PDF — malware analysis report

Static analysis result for SHA-256 d489ffd15e23e315…

MALICIOUS

PDF

87.3 KB Created: 2021-06-27 05:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f7e3fc1ee8a564077c5b357a72df9f9 SHA-1: 07fb73e20661be21b46f24e3c9fac18d5446e655 SHA-256: d489ffd15e23e315cda70979ee24f8137b7e4b62464533f4482b0c09b1fecd9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics indicate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://inoxquochoang.com/app/webroot/files/images/pages/files/26763774075.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa62229cc1a---levuzafosuzixakoradak.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609874d06540c---puvubivu.pdf
    • http://greenhousehotel.vn/uploads/image/files/96400700083.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d47e915d92---marona.pdf
    • https://bluetact.com/locktactyuma/userfiles/file/80412052452.pdf
    • http://www.tekkoo.net/images/library/File/21758857085.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/227274536abe8c466401ad2d055c86f7/xaguzopozimavo.pdf
    • https://ludifrance.fr/userfiles/file/sitotutixikazur.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6a51b9267---jisirazixi.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8170db46f---62148350165.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/bf1e923643f0bdda01c1ce7ec6771539/18074460133.pdf
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210610_B1721B8121A77762.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/c7946d22f61dd23952de1009fec1f560/3961297392.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081620fc25d7---kulijigomolizovuronugam.pdf
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/8390444305.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/063de7d95135e646a6a83354d99ded8b/48784403145.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160701b91e9ba2---10928560106.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/5d6b22f46929865470679d06b27a2627/29725970786.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b76f80296b---wumewoniwu.pdf
    • https://thepainter.asia/upload/files/3394268693.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e59c809be3---91714630092.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+new+mutants+free+watch+online
    • 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_off0000ee7c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7C 16792 bytes
font_01_sfnt_off0001068e.bin
36ff5fca8df5cc3c137c610ee693d2c22ed667a8302218ff63cd182f74e2f1bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1068E 18112 bytes
font_02_sfnt_off000135f7.bin
4156763aae49dfbae480c6d5f6448f7997afe850e00ed1ec7fba4546e7e7bdc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x135F7 10752 bytes