Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8e8990823c62c6…

MALICIOUS

PDF

83.7 KB Created: 2021-09-22 09:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e841d6a3022a1b1554117ad3460233ff SHA-1: 75cdc42481604774fca57d488ad476180197350b SHA-256: 2c8e8990823c62c6679981173b4c10b2bb0eb2256aa4d2180556235d3e0f9071
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier output strongly indicate malicious intent, likely to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=google+cam+redmi+note+10 PDF link annotation
    • https://marblo.ph/app/webroot/img/files/powunukomaveritirazozun.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16320644661208.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/1194754798.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/gojukezojegux.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a912ce954---63454740811.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/1430577136.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/murujibakonub.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/4960348719.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/64480298547.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d75132c040---65809070918.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/8co6taedik2s8tubee1em2p1v4/51555444396.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/razawivanizudoli.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/56563829804.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1632094275.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/92899642647.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/20586077342.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/49092464906.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/kogemanagegogol.pdfIn PDF document text
    • http://abwva.com/uploads/files/sajotiwojerasawim.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/41380914271.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/5283964123.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/puvudufojoso.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/8912072586.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/53094333013.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/maxukemebagininulepagas.pdfIn PDF document text
    • http://strandedtattoo.com/file/welidumexoninaz.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_off0000e1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D1 10756 bytes
SHA-256: 318dd5e9ff74000f1c97cd6e0b5ff879c82ca1e074872a126dd9f7b0a4f336dd
font_02_sfnt_off00011256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11256 17768 bytes
SHA-256: f2cb398f4997a3d19042928f18facdb5802bc824e66222a60861c8954a4f9229

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