Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3da79f251bbf8a5…

MALICIOUS

PDF

86.9 KB Created: 2021-07-21 23:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 06a1b8b341815f222f4fbbe1a738d68b SHA-1: 439d3633c937665c743e6e2cf18faf465ead1dea SHA-256: f3da79f251bbf8a5117a12f8f1775c456d9506889fe9d54187465bb305f35e4b
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as lures to phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fea0ce252f---sokafides.pdf In PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/wakepasuzuw.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jiponotozetalufefumuwawi.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/perofoxozazom.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/c42c09fa17eaf584321ff09e187e145f/tifojoxomepegap.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/vumazuwed.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/31224405990.pdfIn PDF document text
    • http://gloexdr.com/wp-content/plugins/super-forms/uploads/php/files/01d97e86722fea80a97e1efa60fc6892/45755340060.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/tutopukupogadexaperomek.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b39fd9b2c8db77231471e5fb3d42226/50617508364.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/90793384820.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/batotuvuxujagejepu.pdfIn PDF document text
    • http://slsnn.ru/content/file/99257692908.pdfIn PDF document text
    • https://fobh.net/userfiles/files/61261163704.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/91361792901.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/q21crpm3qaudb59j6cqj6mll87/53039525245.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/48e412b12698c09b2028a32e8db11df4/basagiv.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/qaa6pvmrlqhc4sc448q1f5gc87/97410729551.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/kegew.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ehjjf96oi6eg6u5kjqm7v3hj33/kosujudezolanusebogo.pdfIn PDF document text
    • https://kede.org/userfiles/file/bogoxemuxafutekexavefe.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/kizabarajosaxasobajanup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=physical+therapy+abbreviation+listPDF 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_off0000f052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF052 10792 bytes
SHA-256: 43edd516c267de50d190b5d1971f63ee7d83fec77d12ae445558f14536e9ff32
font_01_sfnt_off000108f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F3 16924 bytes
SHA-256: 5e3efdce6633e32b8e494de59abbb1e3ce70c53c4b56b842f538ecb7deb5d429
font_02_sfnt_off0001352c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1