Malicious PDF — malware analysis report

Static analysis result for SHA-256 e26f7fc4f88a26c6…

MALICIOUS

PDF

93.6 KB Created: 2021-07-04 06:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6f949cfae7d62bce4abdd518fc38897 SHA-1: 0195e114691bca12df1958bf46178301f3e1afae SHA-256: e26f7fc4f88a26c63ed02c0f27139d3e34de81b620c88025de94929dd0ce96b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content, likely via embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://alternativecarrepair.com/userfiles/file/79491702011.pdf
    • https://kltccompany.com/ckfinder/userfiles/files/zafijaxufi.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbabab50bc---90688354943.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/63cf4103f534572868a0f4e774ab31be/31976010887.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609629541599a---55076484017.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be794b43718---14928027808.pdf
    • http://drjoecarver.com/clients/49355/File/13159178255.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a32e2077af1---8740757052.pdf
    • http://wmc21.com/ckupload/files/74812817071.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608dccf395e71---9893446584.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f416c2ff6---61065653808.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/8a483fbfb40181fc5d3d087a86513e30/36750865178.pdf
    • http://xn--szabowski-tub.pl/userfiles/file/nigopuwejusukazasuwik.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/eoauvuvt3b48m3ak8cj8p1u2rb/bozijawelexalilusowo.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba3a8e5a6e---7833313548.pdf
    • http://messtores.ca/fck_user_files/file/39495716263.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/b2a7c13bfe93a2784f9fe4fb4d4f24a3/magadavu.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/54c447051555f074a439c51517c23726/87165684090.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d094d2a977d---97002815.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/1d8968bc1e594b5246cf2b7abe9dcb83/xakegivugatatagu.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7c0151a9b---witimowonirozebalano.pdf
    • http://teenaramainc.org/clients/875997/File/sexaduzubek.pdf
    • http://kiavysocina.cz/UserFiles/File/texuxifem.pdf
    • http://christschoolblr.in/userfiles/file/wibofovaguted.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac67059f552---91543865354.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=chinese+new+year+class+games
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f125.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 16312 bytes
font_01_sfnt_off00010730.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10730 16792 bytes
font_02_sfnt_off00011f47.bin
d9f76fd6f0bb749865890ca24c030bd2ab0e4e8e35311dfbaae8830bf8b3078e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F47 10692 bytes
font_03_sfnt_off000137ab.bin
5365ed2df2808fda90b25cf69162302417c9cf916286eccd6404b5fbc706b34e
pdf-font-stream PDF embedded font (sfnt) at offset 0x137AB 17944 bytes