Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80a5d8bf9358219…

MALICIOUS

PDF

84.9 KB Created: 2021-09-04 11:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 081a5fa60522f44403e2e89ea97f0a68 SHA-1: cad8a20cc0f10a6cf12d035678ffb934b26810ff SHA-256: f80a5d8bf935821921965b72c892bff8abad4e1cfe33b8b9bf91d6f76e074afd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous unknown URLs further supports this, as they likely lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://khonggiansachhanoi.vn/uploads/files/xenofezixenaduwomofilo.pdf In PDF document text
    • http://worldcar.jp/userfiles/files/toxixatafukefose.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/48847759785.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160808ba0338f4---6462963372.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/39844380820.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/vi1l15s98alvas4ffjtlgo3212/mekovirozovi.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/85546598095.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16107992b69454---53110551611.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/tugigag.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608142ec7174c---59228976059.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/6542470aebf44cd18475c2b9d1d49eab/74229725827.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/sefumuwezukijuzujanor.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa51e95cb80---61483447073.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/fetibinezewo.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25c110a3f7---guloz.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160792f96b018f---66556865533.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec05e298f5---34112300472.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/1ac5ea386fcbd0c69e757eccc5595703/fadukezusira.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/a1e5ec4c36e39530112882fbd2f5bd8a/mebubimegumukokujode.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/fe3jskuop2ffjbraoabbp5oqv3/76594923465.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/puvojuj.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/6331b97be94e0aef3e494d8ae8bd45a1/11738994213.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/49120768482.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a443261737f---77734487539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=nda+exam+syllabus+pdf+download+2017PDF 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_off0000e535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE535 18100 bytes
SHA-256: 0471e7437bd2237438027c707cd40ee60922a31eefe1f01792b4be72ceb713a5
font_01_sfnt_off00011425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3C 11232 bytes
SHA-256: c8862966608f6023ad5309a9939c957690113f0c47c75e546b8f2fd1e1153533

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