Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99457e9710a7805…

MALICIOUS

PDF

73.2 KB Created: 2021-09-21 01:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: de5ec3916a2eea52a2a69b83decef766 SHA-1: 71aabaeb33fd923af3d5b5da5e79337882de9bc1 SHA-256: a99457e9710a7805ff38ca7c3369f95ee4e1a6c464b00008bbb07a45a1205706
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded URLs.

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://catamma.ru/uplcv?utm_term=how+to+update+play+services+without+play+store PDF link annotation
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe6d89369e---zavarezijugafutadu.pdfIn PDF document text
    • http://micruts.org/userfiles/file/2220390848.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210920_665CD6A8690A5DA7.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/94393830804.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/67297767701.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/93173398738.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/fijolomirevuvij.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/29556964602.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/titima.pdfIn PDF document text
    • http://kaies.net/upfiles/file/volewo.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/milajozisepiguwaxu.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/152703834261449f3839b46.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/xemanudi.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/tatosibenidef.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec4bbe4ad6---79737310519.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jizawawig.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/45030086618.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16142468039ccc---22750296473.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/26886318915.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614893a37d884---fapivoxirimijabasujeg.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/11080005383.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/67033606538.pdfIn PDF document text
    • http://contelex.it/userfiles/files/sunupim.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/selegozonapiveduxa.pdfIn PDF document text
    • 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_off0000bb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD386 16572 bytes
SHA-256: b6236ed747cc1cafd150ec651fab340d5237d7410aaee4b7435a7a1105b70766
font_02_sfnt_off0000fded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDED 10864 bytes
SHA-256: 12bfe7e7e708a6fd710ec608f71b8957d2a1643710c28a6c3bf94d8a4ea7570f

Open this report in the interactive analyzer, or submit your own file for analysis.