Malicious PDF — malware analysis report

Static analysis result for SHA-256 f618566a673625e1…

MALICIOUS

PDF

84.8 KB Created: 2021-06-29 21:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 991f92f22403fc9bf041e7fdbd321915 SHA-1: 4be2d047a2a490dbcfe829b1cb34c9eaf4b804f4 SHA-256: f618566a673625e151f4dc287a4587b2b37a0b51cc0ef2bab9f9bbdffb0be6bb
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

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://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093f3c09f48e---boputule.pdf In PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85801428920.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3b3ufq12jvdh7qr7plu6u9i056/nipupuwozadif.pdfIn PDF document text
    • http://93564497.com/userfiles/84778479919.pdfIn PDF document text
    • http://computerdoki.hu/user/file/tatogafomerupe.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/149110120460befaaa0647d.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/72900839702.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160739e1dedd96---sizodutox.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a016994c46f---58410079093.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/306858a7f631d427327d746286556d57/9577146443.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/zowubikunizudejasavofen.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/milepamogapukixureg.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1620645345.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befab5e9d00---46795786669.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/25337951987.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/97064180418.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/77813053863.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/89663538513.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ecf6c5365c11ac1a30e0c05ee0bb6a7/79986205559.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/bozorawufefapimotegedo.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/73855643137.pdfIn PDF document text
    • https://mszukam.pl/dat//file/68349586467.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/93652030806.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1622349764.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/rakigikukawedazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=paint+stripping+companyPDF 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_off0000e993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE993 10652 bytes
SHA-256: 56a009958a57d4e949b756624d29f89933c3275276054b89a30f44e64f585b54
font_01_sfnt_off00010200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A12 16780 bytes
SHA-256: e97c9ea06ca13e408582025d43edbc10799504b8ffefa675da488e3c63f7a417