Malicious PDF — malware analysis report

Static analysis result for SHA-256 a555f888333d693a…

MALICIOUS

PDF

83.1 KB Created: 2021-10-18 13:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 128ffebe9d550407b5fd40e347f610eb SHA-1: f53e668d28edc80508b6cf74a79bf23d2790bc26 SHA-256: a555f888333d693a9d18ae145c3fc1950a155ca00a3f115e5678e5f981346611
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV also detecting it as a phishing trojan. The document body is heavily obfuscated, but the presence of a 'SE_ENABLE_LURE' heuristic indicates it likely instructs the user to enable macros or editing to execute its payload. The numerous extracted URLs, many hosted on disposable or compromised domains, suggest a link farm designed to redirect users to malicious content or download further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://czytamzezrozumieniem.pl/userfiles/file/53801642985.pdf In PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/819a4c74fab3eaed4170950dd7f981d4/72394980157.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/takutirojef.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/gefavofala.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/tudozolelawuvirifod.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161604f3cb49cc---59389617237.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/rigokujofoxikunatekoni.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/37380368133.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/refowifabitu.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/lesanomalikanusutakosumo.pdfIn PDF document text
    • http://signfabapp.com/ckfinder/userfiles/files/46621896629.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/mutebotivulitefovudonavin.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/40023838183.pdfIn PDF document text
    • https://sambelteri.com/contents/files/bekinidasutigikebapifup.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/kinixebibaxoge.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616491f864bdb---39414067690.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/61826196208.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a747c2dbf---tenuwazosexabufuraroririd.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///bibunirari.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/diraja.pdfIn PDF document text
    • https://slavicchurchmississauga.com/fck_upload/file/dozikiweb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/23D8k0Ec_6w/uplcv?utm_term=fallout+3+unofficial+patchPDF 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_off0000e265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7C 10424 bytes
SHA-256: f8b17fcd464033eb72c1325c8155c8eb1bf8945bf651a3e6bec53c44d32c125b
font_02_sfnt_off00011206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11206 17908 bytes
SHA-256: a658aedfbaa6fc9da181f09d037dbddad35380cd5118cf83bdac7f3eaa1db656

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