Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f2570572faf02b…

MALICIOUS

PDF

81.1 KB Created: 2021-07-29 17:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8723c8f8b88ec46360a72eb72101f70a SHA-1: 4592b888fe25e9697ca04bf66e6f7cea96aa1392 SHA-256: f4f2570572faf02b2cb34db617aba776b2aa49ff4fc43eb5e06177db3fc606bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farms suggests an attempt to direct users to malicious content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mwflower.com/upimagesfile///rimipifa.pdf In PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/nobajemutagerorug.pdfIn PDF document text
    • http://geasit.it/userfiles/files/wasuzebuk.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/xanoxumapobakawigamot.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/febovifib.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/bepenadesunifa.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/muvej.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d23bb76a070---5878430307.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/xetetexegeloxajuvuj.pdfIn PDF document text
    • http://unseretochter.ch/images/file/zozefodazapesar.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/4220265855.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/bopep.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/wonapopuvologawemifaj.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/2260b00fe35db5d1102a9f265c1fd8ea/dolamezesozomo.pdfIn PDF document text
    • http://arcadia6465.com/clients/f/fc/fcac8d81e62e7f23ed02b02243def538/File/gudobetaxugadotu.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/na7tu8meqqul9lc2hi4tsu4pf0/55514699921.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/28545645871.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/p2h9qfc1tu1qqnmi0aoc72qhh7/8752835567.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/57748653999.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/bcb09bdda8bfd3bf56485afffab9f0dc/lovegok.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/50882869477.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/newebimumasatesu.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/5343659545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+replace+battery+in+garage+door+opener+liftmasterPDF 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_off0000d6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C2 16524 bytes
SHA-256: 5a27b01c1d05f6f46daed95f06fd2cca76988da282b285cc8bdaa91cfe93df54
font_01_sfnt_off000101b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D0 11292 bytes
SHA-256: 624906512c76d79cc41fc13ad73069a8e1a9be637c4e4cf6df5b6f726e7c3b74