Malicious PDF — malware analysis report

Static analysis result for SHA-256 84743afdde853205…

MALICIOUS

PDF

70.6 KB Created: 2021-09-23 14:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a32b211a5e9063b5566a6054e50e1402 SHA-1: c6fe9182d5d9ac45c9966906305e6a9b5e36b9c5 SHA-256: 84743afdde853205cb8a39aaac4578ecd11027a284a6d0b302cac871a007d402
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the link farm structure is a common tactic for these types of attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://djapm.com/userfiles/file/52489907269.pdf In PDF document text
    • http://3suntech.com/UploadFile/file/20210917215034514.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/tinuzodunumomawigujamo.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/vatuzebigogosegibovagu.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136c14475852---61649736968.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/9334416301.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161448eb2a8061---4579787366.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614c4d22dcd12---loraxutinezavon.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/gikigewiko.pdfIn PDF document text
    • http://bluebossa.pl/files/file/geboxa.pdfIn PDF document text
    • https://maymac.info/userfiles/file/3954689164.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/98925561623.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161404b4ca7be8---xetobuda.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/rurigegomugifomozagu.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/24633523571.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c65411e32c---28010411181.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/e38b024d3051d33a28bf36baf90a30c4/8383819265.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/vubegogijigo.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/78934060643.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/21090113520646062082je89.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=google+android+apps+store+free+downloadPDF 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://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_off0000b76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB76B 10796 bytes
SHA-256: 4059c3c48f778608091de8c317121491c017e2ae47353823bf6c58fb448727d9
font_01_sfnt_off0000d04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04E 16572 bytes
SHA-256: b39cc70a7f11c018321c1a9c46d5d2d14a0d0fbd1b8344c5ea654b40077fb33a
font_02_sfnt_off0000faa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1