Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddab709fb33a2c2d…

MALICIOUS

PDF

88.5 KB Created: 2021-07-21 17:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7b144f34e546a9c5c3646b9b022ece64 SHA-1: 050cda5fa326a7504f35ddd31940530524052743 SHA-256: ddab709fb33a2c2d2207c4b27d8c2eddb86cf462f9fb93c0985c3edf88334804
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites. These links are likely used to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/c4a17fa332fc24b34b773edf3d2d4016/29366098170.pdf In PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/0047646e4f2872180103e7f3964758c0/46655591664.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/snhmgf976akqoobgukib52a1no/54261969272.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079bcb0ae08e---koxodukemawozes.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/gukoduvezuw.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/finawegesosodal.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f3ebbf73e---xofidevupi.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7a5338206a6d33a5662d4c700857f80f/5493419229.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/vodumododex.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/16899463021.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/cb33654a56025ab8db1923d353bbe4ca/soraxaxo.pdfIn PDF document text
    • http://ligneus.hu/upload/file/nadejabuwojonomofurosi.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/94708674008.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076156042a70---65151152461.pdfIn PDF document text
    • https://silga.ca/userfiles/file/nekatiwifarokuda.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/cf4bfb058a9e7fb40f6671a6dd636d37/pubewajawonisa.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb985376b5---tabadenibuwopusasikuwo.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/reret.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/9617cd244f236069cd9e29ebea400bd5/77504296858.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/jewavemelotapodunerix.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/t95198hmoetvrcs1fvu142cqg0/96637047945.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eb955674d---79259586486.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b50acb14b471a4501c686158b171abf0/30882281578.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6a4418238---zenob.pdfIn PDF document text
    • https://autopratichesas.it/file/85263701209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=functional+chest+workoutPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF814 16860 bytes
SHA-256: 3f6cdce0cb344832492e56df6cec7e61a6136a6ba09883f26138891cd4170c9a
font_01_sfnt_off00012408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12408 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1F 10580 bytes
SHA-256: c3b15e743b5e9e7c521937335f1411c6a37e5b879d30ca53643a962c70144c53