Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2fa8b1501d00bb…

MALICIOUS

PDF

69.6 KB Created: 2021-09-07 22:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4e9f05c156a4fb4f66bf6d2eb4063b57 SHA-1: 29c12fecd616252854db668f62cb28ded659466d SHA-256: da2fa8b1501d00bb931064247bc9e3c49afe4112978cff04de81aa9705100a85
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to multiple distinct hosts, some of which are hosted on compromised CMS uploads. The document body is heavily obfuscated and appears to be non-readable content, suggesting it is not intended for direct user interaction but rather to host malicious links.

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://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/6627593e71b42f9d45f5905b0168a158/90597949094.pdf In PDF document text
    • https://atvatextile.com/upload/ckfinder/files/16616693398.pdfIn PDF document text
    • http://ledson.ru/upload_picture/44787166882.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/044577fcc69e328cd5cdbb5dbcd1d9c5/vafokefizodavelikukuper.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/98946347720.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f487a95739---69470060192.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/20145993377.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/zabumopadikofivijiwodul.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/xapuduzovasazuzuwuk.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/sudoxojupu.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/6657447550.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/leladoxiwipoxapufes.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/34719351992.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/57577267002.pdfIn PDF document text
    • http://ashioke.com/images/library/File/69609653372.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d06b284c7a1---65496982591.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45880204533.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb45d87bec---kinikezosisagevovid.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/komesem.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/xexopugas.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/pinulujumiwoximegut.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/fb0dae03be48797695ec895b0adc34f8/poxefirodiperakojejatigo.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6bba7105d6bb2ec1190d840f5dd71004/terajigujo.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/puzetod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=physics+textbook+class+12+maharashtra+board+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_off0000b09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B0 14564 bytes
SHA-256: 1a6ace143c4a5ff1d2dd8bce389ca82563b8b92331f2f95f5b05c1ef38b8bef4
font_02_sfnt_off0000ed8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8E 11400 bytes
SHA-256: 665cf17746301c6fb15709c74ddaadef44d594532eff1e3d66355c5ea5869a63