Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c40a6974164445…

MALICIOUS

PDF

92.7 KB Created: 2021-08-01 07:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: c50cc8210d4998fe4c41d72b247e71a4 SHA-1: 0771b3d9156a1395feac242ed63511c46d912167 SHA-256: b2c40a697416444590f5a695c1fa7781ae7fdde876e6c4fb1458889b677c92c4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the final destination and potentially leverage SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/0fe2b3f3d1383437b7995bcd9764316e/83624146184.pdf In PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/0f0ab19cac9b78b74a80e129ec652085/netigotaratinezikex.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/motumaxixaroviwiv.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8acc3d135---fuxuxapizufusilopo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d00baea41---zabixorakoxufinumer.pdfIn PDF document text
    • https://majubesar.info/contents//files/fosekuwanikekeketaju.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/gutukimizupugofakefeva.pdfIn PDF document text
    • http://mrsgladysosei.com/clients/f/fd/fd76c46f75d01f7adbe86f52c2a5b8c1/File/wotakidizorirulo.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08d99b4a8f---lerolopubifuloginiwav.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/61084598155.pdfIn PDF document text
    • http://chapelguild.com/images/usr/66415560599.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/63605497234.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/vumenilurotitodefe.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca06838649c---tukivewozufaboresufep.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/61607852826.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f28cc108a---64551286824.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a40c1722918f77fe31532e1dd3cbb9bf/namevizok.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c139599397d---14066250265.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/vuxuxakuk.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/2e0adf8e0d85ea755635f02d475f640f/subajekojitesadun.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16082b16906408---tofekozuxadekejitat.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/9f74986bba23b04ffa241f606794f982/21076936480.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/26589313356.pdfIn PDF document text
    • https://haidangpc.com/contents/files/josufivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=planilha+de+or%C3%A7amento+de+obra+residencial+gratisPDF 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_off000101c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C2 11156 bytes
SHA-256: fefbb28a94dc46e290c3920e0ec7ca811211434b2446f37d6634ee42eeb335fb
font_01_sfnt_off00011b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B10 18880 bytes
SHA-256: 5b4d320426267ca0655f758f2f718e2219781ea4ffc56aaec0baa0b3310c19e3
font_02_sfnt_off00014973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1