Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d0fa803e3dd9e2…

MALICIOUS

PDF

75.1 KB Created: 2021-09-10 11:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a6a3be69c7c46154caa4b5aaed92676f SHA-1: 222efad961fbdb819102a3cde39a7a533e4d600b SHA-256: 55d0fa803e3dd9e234c50dc4473ccef3aade931a613e1f34960edeb5111e8e21
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various websites, some of which are hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inventory-acepipe.com/images/uploads/files/37417073659.pdf In PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/8d8q9ivbu52cn7temudckmgkcb/82828071918.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-09/images/files/40681448208.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/17244823806.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/90223790232.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/wedaxawojizatenaxupofem.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/kakimajusinapewezobuve.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/11431373387.pdfIn PDF document text
    • http://kes.org/upload/editor/files/12107663580.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/11371869249.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/42289585482.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/54f791d965dc65e79dcee1dd32f77b5c/jigolipupamebafu.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/pipedisewasafilenidef.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/85030615334.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/zalojomap.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/10426286336.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe4965ab64---12985623143.pdfIn PDF document text
    • https://dm288.rs/slicice/file/rulavox.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135568e2f373---bitudagasititodurez.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/51164269985.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/93522388579.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/nanukujifonutadejibi.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/12079160962.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/45755856366.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/gulanafamutukotoxude.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/15431036528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=kingdom+rush+online+unblockedPDF 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_off0000c379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC379 10880 bytes
SHA-256: ec4dfa7a8086649a8690bffa167ab95b1cfe1a25eb21ccc997fae9b720f774bd
font_01_sfnt_off0000dc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC19 16480 bytes
SHA-256: a97a26ca7677b08b7635283d5810cf07a73ede515e96fc34acdd22a712b3acaf
font_02_sfnt_off00010696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1