Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc18e32ebacb7270…

MALICIOUS

PDF

88.1 KB Created: 2021-07-21 22:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6f5c0fc1a5a35ffaefad29cf21da8e05 SHA-1: d40a0639b7a8e35933664b6ea2b2d5e201897633 SHA-256: fc18e32ebacb72700fbb41cf80ea6de1633c117fcadb4901c096e9ae8a9d262e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070574aa180c---35381801986.pdf, are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/cea0b9d826212b035c6bd0536dc0bf5e/sajilitogafi.pdf In PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/mka7tmt0dr3crigd10065f8kad/nozezi.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ji6mm7hn1p432ck2112p4pbbd2/movixidimajimakafupuzuw.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/rufogijafono.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/4f29f32b042c7777073ee8ab622573fa/suluruwewokobewofota.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/59067131737.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/fowemimeguginaxesusu.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070574aa180c---35381801986.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/24123515006.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/77115123001.pdfIn PDF document text
    • http://strandedtattoo.net/file/16184997956.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/fac08414c2f19715f8268d7d07e80af9/12830792033.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210528223002.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6f79c0f8f---97593437367.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/60i5isccga2pvng0drsp9iq52m/sejebelojufum.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/96279520475.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608231411c003---53434609077.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/85419647515.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210622_3116BBFFECC4402F.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/sapaw.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d81e8fdbad2---xajoz.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/woxupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=marketing+mcqs+with+answers+pdfPDF 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_off0000f408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 11220 bytes
SHA-256: 6faf54cb72c4ee1713df549992f72932682790627671cbab99143350da780f1c
font_01_sfnt_off00010dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BE 17180 bytes
SHA-256: 54cae214b9f224246c0b741b4bd538fe40a6cbb52d9a0eb0054b851011455920