Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81af4b19d95df8f…

MALICIOUS

PDF

149.6 KB Created: 2021-06-27 01:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: ad95e961b253de7491f3e23cd4541c89 SHA-1: 467c7977597b494081add05153d0837c26f6fbda SHA-256: e81af4b19d95df8f4b364e9a0c612448c96bbadbb83a2b9d67c23eeb6708bf6a
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 for phishing or distributing further malware. The presence of multiple distinct hosts and the structure of the links suggest an attempt to leverage SEO or distribute content through compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/103d687c5d7773f34d6cef186ba59822/10258850467.pdf In PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7629ed7bf4---rugopegaresum.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7d578163f---nusinepuwovolono.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b047b50633c---zikubarivu.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5ae48e901---48192234836.pdfIn PDF document text
    • http://614move.com/clients/4890/File/80322598856.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607182dd2cb99---25079760504.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/8ec9453d1951d4392a55f4450fd41397/kubejixamexodojowepuru.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804123161df---gevedar.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908e36d6310---65258782573.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/jaras.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/vinaw.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/35523da925f819ca845f0a305084696a/68243029680.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/6ffc0ae876e0e897bb63ad6dc1bfd8e3/kurolub.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/mu8017r6etna66d2fdnvq9gh4v/vivikasekulabexinisut.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079c9e91ed9b---gadaladufajexusen.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/de370f6acfcc9a85824890b7287b1d57/gidunadoganutana.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/gatigukivajimitinomibog.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c465f62f94---rudaneketizuvejoluzuseg.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609592a29bcb6---70809623330.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///22646067228.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/zuzeludilodaviros.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/gifowakalarubivugevata.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/u7ra6o5vjqfg6u28i6url23euf/jofefowerexafibelojoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=childhood+stuttering+causesPDF 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_off0001e6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ff07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF07 18880 bytes
SHA-256: d98b7ed9303900c9d82a8b1b6272c63548b32195a31b0f82fd4d98e871c33fde
font_02_sfnt_off0002300a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2300A 10780 bytes
SHA-256: 68f28fa74bda5f3208fef22ae7dbcffa823d57fab02dedc211f76e1f05386b98

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