Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc162536c312917…

MALICIOUS

PDF

80.3 KB Created: 2021-09-10 20:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c9fb063377ee535a08107f0639193408 SHA-1: ad064710ddd9e660ee68203ffe1784feba4beeb1 SHA-256: 4cc162536c312917b873b89a31a1e1974693e5feae2f3dc5d85f81ec2494d5e9
156 Risk Score

Malware Insights

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

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, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. The primary purpose appears to be directing users to external resources, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=ac3+filter+for+android PDF link annotation
    • http://phongthuyphatloc.com/luutru/files/42683038884.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/11220554322.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210904_E76DD1DA5CB3A3CE.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/sagub.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/92176983865.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/gitilonimovaverunufikiwow.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/52593131272.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/fazitupizebezovomilokizir.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-10/20210910154331727863.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161391064dde0c---49448492753.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613349e4cf5b1---dabilinepezujebo.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/nulavumiwejavuguzanab.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/724620189.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/69803805194.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/tepojofapozalolubud.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/a27c90fd5656724d18f44f13dbd0b092/dafigidofujemak.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/noriridopupagoxukuvebu.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354d427d225---2172728146.pdfIn PDF document text
    • https://kar360.com/resimler/files/tonefewofugikasilalegubaw.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/57cdb593005e937960700e0147f588b7/lopofakugawujefanofujo.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/zoromazekajemilugexuvat.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109031103576963.pdfIn PDF document text
    • http://ttc-investco.com/img/files/65451777609.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_off0000d1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FC 19568 bytes
SHA-256: dd227bbe448d9f6ff6d9e0014aa86df47e844b039ac7bb8945610baa78298fce
font_02_sfnt_off00011b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8B 10452 bytes
SHA-256: a15289564cb6b9f993a316ec29a74335ef730fad4ad2f8ec5ed80ed9beb0bf88

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