Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee982b4d9c9fa8ff…

MALICIOUS

PDF

82.1 KB Created: 2021-09-02 04:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c0d4503803afccc9c8f7b2c59fbf5b0c SHA-1: 8915043cf9ca031c5fb6769c99e81ea4c536a54a SHA-256: ee982b4d9c9fa8ff11f7ab318b76d9be785d9f07355de9a5fcaca19cd958f307
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The 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, directing users to multiple compromised websites, including a WordPress upload storage. The PDF structure and embedded URLs suggest it's used to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://irlanc.ru/uplcv?utm_term=underrated+vocaloid+songs PDF link annotation
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/zuxotizexaxavokiromon.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-22/20210622224159772164.pdfIn PDF document text
    • https://trieurodata.ro/images/file/weruvijupuxegupilib.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/gibosadivixe.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/lopefejokuzolu.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/68856631260.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/6244854199.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b50bb2582---ganes.pdfIn PDF document text
    • https://serini-cloud.pl/uploads/editor/file/35991882846.pdfIn PDF document text
    • http://sushi-belovo.ru/files/gakisekelowavan.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/36ae52e128bfcef4f25ba7adc916a67b/furezuzimupudasis.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/1495235329.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/nexubixarekowera.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/12320146728.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/33737781412.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/sunuxe.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/035451be23e4a9f173499a4a8f06788d/rikajorokijebugev.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/bb3d7611fd8c6b44096d20e7c7d36093/fonofaxorode.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607807805318f---gatawe.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/lj9t0rptkhsl8879dmdto3ku20/23371003353.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/94861696178.pdfIn PDF document text
    • https://bnovum.hu/downloads/konugimovi.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/a9q2c6252pbek464eelf99t19e/34644330020.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121967d919d4---welej.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/92994849977.pdfIn PDF document text
    • 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_off0000dd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD17 17140 bytes
SHA-256: 597d3c785a8a6f3005d1c9b52ddc7d5a92b718fd27b4c51e7f56b8a10cc196f9
font_01_sfnt_off000109c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DA 10620 bytes
SHA-256: 49e15b1e0e7f5e6f521c949c1f74b8d9b77a94d8d72e78e653fdd2526e2b43e3

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