Malicious PDF — malware analysis report

Static analysis result for SHA-256 82dc30cf678ba7f4…

MALICIOUS

PDF

87.5 KB Created: 2021-08-21 14:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7528f1c691b20139857b5c297b63214f SHA-1: 0f56f482a6c34035e5de474701295c43ee130c37 SHA-256: 82dc30cf678ba7f40b59fc4e08375ccef281d9fe6accda69a89d498f4a581c50
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier, indicating it is likely a phishing or trojan delivery mechanism. The presence of numerous links pointing to compromised WordPress sites suggests an attempt to host and distribute malicious content, likely a second-stage payload. The document body was unreadable, but the heuristics strongly indicate a malicious intent to lure users to download further malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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
  • 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.
  • 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://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086249959f18---93426927839.pdf In PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/11514908097.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/16j1p6p9t85992pmvr9b7mver2/55771899199.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160867dae6a5ab---sewidovepesupagalef.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b401e42140c---87233570505.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/83244982520.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782b4329a6f---vosobuluzezo.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/33399726412.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/196b286a8ebe6628c4db2ed92b3eec6f/19591579537.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/sowedonino.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/tiluxigobuxujamux.pdfIn PDF document text
    • http://jarosi.hu/files/file/xigiruzaxegonineba.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/mubinolevetekoxefarusad.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/36726079270.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9332d7b49---71530146026.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/25130564858.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/73079338183.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021081713212698.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/81fef84f18054d2b1eba99558dbd77f0/6261536397.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/38735416663.pdfIn PDF document text
    • https://laser123.com/geektic/files/52017993980.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d558e012bc---dudovezu.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/kafonexaf.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2795ebdaeb8dbd930a81655b5ddb721a/97189251090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=platicas+prebautismales+en+linea+en+chihuahuaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE270 17976 bytes
SHA-256: 7a3bdb51a1517c4ce8d4200ccbc9f3ecadf87117231aef093dd41350545d1cf1
font_01_sfnt_off0001106a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106A 3148 bytes
SHA-256: e8b076eef29cfb1b8e5f31edf3820c126e412a1ce0ec67d25dec0bbf992f5740
font_02_sfnt_off00011d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D25 10760 bytes
SHA-256: f09987eb81fa62f1f4e7404443e0403cb88365cdd619d80cfe5c40cdc5f1a202
font_03_sfnt_off00013575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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