Malicious PDF — malware analysis report

Static analysis result for SHA-256 487c42f4c12dc3d3…

MALICIOUS

PDF

85.0 KB Created: 2021-08-26 02:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4aa5cdc677d99d81e90c10c3b18d93e8 SHA-1: cabfa2097947036e8774d0b4dc3f718a96f59d2f SHA-256: 487c42f4c12dc3d38041a2013b8ada789d52899a68868bc1dd6006891cceff57
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://hacsbathtarntaran.org/~/userfiles/file/diker.pdf In PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4b9d77439---zozarugibiburexolawod.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/28448979387.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/rafolu.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/78298225698.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/450c15ea5a1cc750147cce7a93be9873/20656155119.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/af6221b63f4cf0f6824cd5a3a870bc91/gukikolepesolanutug.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/rapunowitexupo.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d4db3b491c---73364392246.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/60884599516.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/gefotogupiwuxorevaz.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/povov.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/mibujuvanibiw.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bfe938ee3---94671174022.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/3b13b4fbc58ece86f45a22ffed2e81fc/xarexutatem.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/fuvidaxo.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/534144154fab12eab2cbecd1f2d4a757/23609426743.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60cd50195---jozirofobadibijut.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/silevetabut.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/kugukitojig.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/96715124283.pdfIn PDF document text
    • http://vasamo.org/pds/userfiles/files/zuwaxojegon.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/doviknjpng1uf1tl7k9gn1mg74/75674288836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=words+that+start+with+long+oPDF 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_off0000e9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BE 10472 bytes
SHA-256: 4cb073150c19e26593f9f01a5380b336c0ab88d02cadf2e789b96374bfec554c
font_01_sfnt_off00010145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10145 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11957 16840 bytes
SHA-256: 539e57da48f131ae8f9af9c669b5b5218a23eb99a68297bcdb43f5721bd7aa9e

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