Malicious PDF — malware analysis report

Static analysis result for SHA-256 931b436d2ad5d00a…

MALICIOUS

PDF

67.5 KB Created: 2021-09-10 23:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 448277f97ffa59fe36645a46ac33e933 SHA-1: b9576eb8b3d5abbd50de0ead5bf3c8212a69dfc4 SHA-256: 931b436d2ad5d00a9071f34055ce4c682a21c79acad1abf35767f5b34737815b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure with an image-only design and a click-outward action. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137532b4f8cc---punetewu.pdf In PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/dimezumepevedepunezazok.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/57618910367.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/18310389215.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/savutedurageti.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/16617024428.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/12719723794.pdfIn PDF document text
    • https://websbag.com/uploads/files/48647411966.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/60625533316.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/biwikumuliwefigiwadobe.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/revabazonenaz.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/jutumobidikomijuwurimu.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/54900835687.pdfIn PDF document text
    • http://kgmda.com/upload/files/29172464096.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613913ba61dcb---pekebofimulij.pdfIn PDF document text
    • http://ccshecea.org/upload/files/gagawosijibarasa.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/nefetes.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b959e44be4---bolazomowu.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/70346931904.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/5453690337.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/disaxududojubegono.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/57937960772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=chatroulette+us+apk+free+downloadPDF 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_off0000ad7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7D 10812 bytes
SHA-256: 50b3d65b499464d9cff04cbf59342c0eaf8ee5ebed42787ad53a93ba815adbf5
font_01_sfnt_off0000c68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68A 13908 bytes
SHA-256: f056e815aea5f3c06bd44998a9f1bb8dd1c86d4fecd7a642c66dc446ee8cf73f
font_02_sfnt_off0000e8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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