Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7808778c0c80f7…

MALICIOUS

PDF

86.1 KB Created: 2021-07-05 09:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 88d1f1d0e62b453f4d45ad3e56650a2c SHA-1: 5c47e3d9966b6424b422fb8f18f86d56835d9aca SHA-256: bd7808778c0c80f7fa86396b2d322bf1bf6bf5e1d942f3dec65d04c8d8e9bfda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, as these rules specifically identify link farms on potentially untrustworthy hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3945f75830---9888959949.pdf In PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/d630288aebdda8374e05830bbd79665b/jokofudubudedobom.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/99712819098.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/11679743069.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/77d6cadd5272c33acb84bc013940a7fe/pexoja.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608117f32f410---roxipatigirofivupu.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a33a1871c---58698351597.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/2sk43ih4o64aiushrtu8nnet77/zomigoku.pdfIn PDF document text
    • http://alconburyreunion.com/clients/36523/File/1888018073.pdfIn PDF document text
    • https://cecprint.com/images/file/30715066956.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/41337967069.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/24922399014.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084d2e89ab60---15985052166.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4550099500.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916cf599a1c---xavoxirukusume.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/merikuxonikonudenexedimol.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/caf4a435a1f92965b1bf23891bc7764a/43307383756.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/18000814968.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762d55770e9---jesawodo.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/qufbc52la9oiu1ig34ft34pkh7/dorikiwuvexalato.pdfIn PDF document text
    • https://led7.ru/file/7889629522.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/9692538590.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9c0f2a524---vojini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=excessive+salivation+at+nightPDF 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_off0000ecee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10500 17056 bytes
SHA-256: 887633b47020b1d684a5e37e86548531936a0690f06d515dda9987a0b8f87c11
font_02_sfnt_off00013166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13166 10560 bytes
SHA-256: e42a35241781ed2d79f7a00804ec85d2855b90bd88157a708283fb50734ccd9f

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