Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5b5948e75a73af…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 17:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6a12695b1b5a3c7bc30b1e7bc571f3ec SHA-1: 91733f485f7a73e8b7525f4fbd53166046cd0b02 SHA-256: 9c5b5948e75a73af51f4574e2e43a77a01be6623fb5adce07bfcd4f49a06f9f6
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple domains, some of which appear to be compromised CMS uploads or hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs are designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://chamdure.com/DATA/files/fabupetosumuwilexida.pdf In PDF document text
    • http://whatcanidoforyou.eu/publish/file/kudedajig.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/9934653085.pdfIn PDF document text
    • http://lawngo.net/fckfiles/86102874050.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613e855604e8d---vidikaf.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f4f36f322---31726066842.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16141389950953---50340683639.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/37576879380.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/67809130870.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/22102155684.pdfIn PDF document text
    • http://apothepharma.com/upload/files/xolunawivijezuvezufolirav.pdfIn PDF document text
    • http://vaynhe.com/upload/files/betopegavovasabexazurof.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/pofamokanukuje.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/wojoliwufage.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/16564324234.pdfIn PDF document text
    • http://poultech.net/d/files/2273338899.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/39094007334.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/vofiwefo.pdfIn PDF document text
    • http://dakov.hu/_user/file/41558076795.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/numapovagizusijimijebaxo.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/pibufexetakikuxisuvep.pdfIn PDF document text
    • http://salt17.com/userfiles/files/70765789533.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/donozedaxozun.pdfIn PDF document text
    • https://eguiders.com/uploads/41246662175.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/248723466.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/16603499612.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=disney+hotstar+apk+modPDF 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_off0000d632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD632 10816 bytes
SHA-256: 6c03f538816de6e1f4a1d4a14adb13e99e89eebf20eed16e6e258752eedb82e3
font_01_sfnt_off0000ef00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 16464 bytes
SHA-256: 11237926a72c4f9c4615f4365d7cbd4e5e75899c5ff4c4a1c10d1a95057cd860
font_02_sfnt_off00011949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11949 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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