Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1640f4edfc272b2…

MALICIOUS

PDF

73.0 KB Created: 2021-10-11 05:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ee3d040a656d8492ce6a585a01a16e31 SHA-1: 5873a961fd6b4f3f426cf492200030819f5bd457 SHA-256: b1640f4edfc272b29f03c0a1dc858103270fb6d663abd430178b7070f7bce6e6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest malicious intent, likely for phishing or malware distribution. The ML classifier and ClamAV detection further corroborate the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=double+log+scale PDF link annotation
    • http://madmojo.com/fckupload/file/59099246479.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/63196432824.pdfIn PDF document text
    • http://kebirbeton.com/userfiles/file/lonuzup.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/bikubirasedofewinidan.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/83800964797.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/lobekodakukuwexose.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/81743498525.pdfIn PDF document text
    • https://fototipia.hu/files/files/48535218403.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/161393fafb4f00---69786931912.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/jasoxezibadi.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/72944312728.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/58856483405.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/tolumagikilaz.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/wikolavegiju.pdfIn PDF document text
    • http://roocenter.ru/upload/file/gukokidutaribokuboruwaji.pdfIn PDF document text
    • http://risme.vn/files/fubemukarojofuvi.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/wupamutaxi.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612edf7b587f7---saxadoporu.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/falegemofusixamuwu.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/9086726396.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/nj8s7rcduu616bbooak4drhhent7ku0n/wevojugedabetew.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/69257566522.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/nedulujiwalin.pdfIn PDF document text
    • http://identik.hu/editor_up/36811494349.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/38444847576.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_off0000b9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D6 10252 bytes
SHA-256: 198c57cfeb14fabcaa3c5f535b047c78b4550a3e994ed0d4055b2baf046011c8
font_02_sfnt_off0000e903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE903 17716 bytes
SHA-256: e7355522dabcdf5dd454a67b86a8f94f8ff25ea2866be26258d2faa4ad96a9b3

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