Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a722e382b0bc77…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 18:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8a62eae5076d0902400acd68a8997809 SHA-1: a050180ff725f63bb04ad128c70c757efd1c0b70 SHA-256: e9a722e382b0bc7718280389d952c34a9c5a747f11b1daa6e30f3fd28bd4cc43
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The embedded URLs point to compromised CMS upload directories, suggesting a distribution point for further malicious content. The document body is unreadable, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution lure.

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 http://edilcfcostruzioni.com/userfiles/files/15013661037.pdf In PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/tixerapil.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/61956827202.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/28370244239.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/wewilevaxe.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/bomusiguminesupuje.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/99635901930.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/leviwedux.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/nutumutumulijowasuno.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/94783475049.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cebd135fe---8293674118.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/39020803104.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/pumutarasuvejaga.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/73104073286.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/puliwobevudurisivaxa.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613c21c27176f---94219428684.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/40933305083.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9024ab616---76022927949.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/42362003984.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/referuvewilir.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e414b4cee4---debipepufi.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/nuniloduzuvizumipikok.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443b5f4e38e---zamemufudukoxisejakel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=vidmate+app+download+mp3+videoPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/ramofimigu.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_off0000e00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00F 17956 bytes
SHA-256: 136893413638dbfc9dec4469193425c573b823c6b0ad8245ee76211ee1d42542
font_01_sfnt_off00010e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E56 10580 bytes
SHA-256: 10a28bd25f53d559795883e4512a3ed83a3be0feb76a978faf3c59e940f86a36
font_02_sfnt_off0001267f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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