Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e9bc687bab2f979…

MALICIOUS

PDF

85.9 KB Created: 2021-07-04 09:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed363d57dfbfd71e2d47761cbdc8277a SHA-1: aa619e8c5cca7b49f65f9538ac8b13a870f8b09c SHA-256: 1e9bc687bab2f9799422b150b8b5777e09f9e4ba2475e1e0947bfdc27342a031
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond its role as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://nuraski.pl/wsg/userfiles/64152453970.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/77823b46f605ebaca390d92693522626/kexinojojuboju.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609243141c84f---81593008987.pdf
    • http://bephoangdung.vn/uploads/ckfinder/files/21975509839.pdf
    • https://soudurelausiere.ca/upload/editor/file/3280761561.pdf
    • https://areicon.com/images/file/gufazubalokefo.pdf
    • https://coatielectronica.com/files/88732136411.pdf
    • https://mudraconsultancy.com/uploads/files/vuzibazukedowikenefodasi.pdf
    • http://simonide.org/userfiles/file/fakitazurabe.pdf
    • http://tpdw.pl/userfiles/file/vafeparekovesiwa.pdf
    • https://mimpiindah2.com/contents//files/mubodubexedir.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821190471d3---40417630413.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/85955bf4f0bd983a0c07274f5e4d47e0/79114705711.pdf
    • https://juraganmonyet.com/contents//files/bokulisakonaviwu.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d909597aee7---86117324635.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e4856c236c2b012f33d8d2d2285b9ffd/86675828001.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/d5350347bab3ccfe7760d55309de843a/53953655061.pdf
    • http://salkim.com/userfiles/file/91658668758.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160839ec06a949---fulepenaravalenegidegiro.pdf
    • https://nasikampung.info/contents//files/wixojuxawar.pdf
    • http://maychamsocda.vn/images/userfiles/file/39354139831.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c56633098b2---46664472499.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/38a48ojo57apedio6o8mkmnbqq/37653893459.pdf
    • https://radmangroup-ye.com/rgfiles/file/5715471703.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/38ejg3oludve29p4ggjer99o85/joxurasovojupuzejoju.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/gnnuid2h28n62ao485cj8glutn/54116680638.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=name+of+compound+sf6
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAE 16792 bytes
font_01_sfnt_off000102c5.bin
8e3767f6ea4650af1d3db9fe75ea26f5a5fbf96346eeb504943ccfa9d7273171
pdf-font-stream PDF embedded font (sfnt) at offset 0x102C5 10688 bytes
font_02_sfnt_off00011b43.bin
c06a87205501958f60dcab46ef0ee8aea56008a51955f2eae232345cc049d0e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B43 18060 bytes