Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4379a76aa12d4eb…

MALICIOUS

PDF

111.1 KB Created: 2021-06-28 01:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 951b58031d5488f3d2ab79b1193f71bb SHA-1: 666610969f27e981bea2e3899b1e917ed327b986 SHA-256: e4379a76aa12d4eb6b711b115f8be216596147c67359fa9cb06b55956865937a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The presence of these links and the nature of the hosting strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://glassco.ca/clients/9/99/99aa1728c1dafa3cf8773a75727b87c9/File/kikutemorivikutuvojan.pdf
    • http://beijingxinzhi.com/userfiles/file/20210615190130_2137448333.pdf
    • https://cowichanseniors.ca/userfiles/file/91155980597.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16083b6c9a6d8b---xufurozo.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074664d6ed44---57967989408.pdf
    • http://www.aadhar-interior.com/userfiles/file/26957858770.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05eb3304cf---1441012158.pdf
    • http://alnadaoil.com/userfiles/file/1230668872.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/bbe238243438109d78bcc31869c64abf/66560944386.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c43a1fb99---58796037632.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/8d48d3feb81e80a633641086bdaadd6e/varasexatalo.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/bc94a5e97ae4e2b03aa220347f36c9e0/8903332861.pdf
    • https://hr-serdahel.hu/images/file/wifajesexajabisagerezuza.pdf
    • http://atthaya.com/file_media/file_image/file/29917271304.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160bf88647a289---60760698889.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kc5halt3l6no2u63k1s3pil1e7/furabawisawevogemexif.pdf
    • http://comp-art.ru/userfiles/file/juzederapu.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e26ee11b53---4579219912.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1430b7781---35794914416.pdf
    • https://kaptenhoki.net/contents//files/rupavumaporenujure.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/ed7bc104f2c709fbb88c6d5b63f5e744/zelefogetisologenamobi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=beyblade+metal+fusion+full+episodes
    • 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_off0000eaf0.bin
b9ac5eb2564915d75a4eedfca4bb6a874da3f1fd30350a5e21476d2e11ef4a59
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF0 35140 bytes
font_01_sfnt_off00014e03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E03 16792 bytes
font_02_sfnt_off00016615.bin
5ced53f96521aa35b60ac7ccd784da0f53241e4e8f6f47f12daee9bedca55597
pdf-font-stream PDF embedded font (sfnt) at offset 0x16615 17560 bytes
font_03_sfnt_off00019385.bin
86f2bf24c866e8f7856e9c45b6c9377311485c1c7df40ce2dccf35263448adeb
pdf-font-stream PDF embedded font (sfnt) at offset 0x19385 10968 bytes