Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae53a7f4b7dbc94…

MALICIOUS

PDF

85.6 KB Created: 2021-09-04 16:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7e53360acee7624f2b168f44fb85f5f9 SHA-1: 4b477d6c2d39da738e1a5b2f2d678430e341bc02 SHA-256: dae53a7f4b7dbc947c63f7e43932422bf1692c89222f0c33e5449da37b24c61d
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The presence of compromised CMS upload links further indicates a malicious intent to host or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=scosche+rhythm+24+user+manual PDF link annotation
    • http://humansharehouse.com/userData/board/file/50030484955.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/19100719397.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/t26qvha75js6k377jh19g1qctj/61247296363.pdfIn PDF document text
    • http://yarpaket.ru/userfiles/file/jijilufaburoveginev.pdfIn PDF document text
    • https://digireg.org/upload/botizopuvosevosexafejo.pdfIn PDF document text
    • https://davaocarrental.com/images/file/kelorikivivi.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/zogisoneduxowenudo.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4a6981467---xekididadakume.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb639ec43e---ronenikenekarali.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/48520057798.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/bebar.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/jelotesetepininirexuteke.pdfIn PDF document text
    • https://jetaime-shop.com/files/93175581709.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/wejafawosiruwowe.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/m97cul2nl6v83mvaprboi40f13/19981249460.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160996dec13fc1---duwufivogexalax.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/3700cae8b1af64d8bd6d8bf77cdea33c/dewok.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9317ae00dc32343664e3c0aacd96b999/faxon.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076849dd04d6---87254971492.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/12175553284.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/81311265575.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/59487418907.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac119660b49---zuremaxofajugatidibar.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613046d7133ca---84083047493.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_off0000e81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10035 10892 bytes
SHA-256: 21769ebdd0876120db3389d7a195404d103d7501c1d0247446500ba33e8e2498
font_02_sfnt_off0001195e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195E 17888 bytes
SHA-256: a35025ed31aef047d6d6b801f6f9436712eaf930f30ef045f46296a93488ee5b