Malicious PDF — malware analysis report

Static analysis result for SHA-256 e03058f7ae755133…

MALICIOUS

PDF

88.0 KB Created: 2021-07-26 13:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71c92d6a2c2a1434e8e0daa16464f417 SHA-1: 3d81da4886c9b94c6910b7b2408a2ac11a7392c2 SHA-256: e03058f7ae75513325cc9fab4a081afdf194bf8b0204a25a09a86431dff82655
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters in some URLs indicate a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/68b2e26c22e6f21b0cc6258a04ae0b0b/bebozavisaw.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c956afcd6---19920343850.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/ebf90b1da85a949f7302a4cc358ca37a/zonebusazira.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607255c35303a---48577040724.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/83a4f00525807e3b9329e0f9be6c2fc8/xozemusisalepemokujol.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606d89fd7ecf2---badewepesuzewo.pdf
    • http://www.darvidproperty.com/news/file/defawojuju.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/7af4b44ef498b826308aba34d46c9c64/53348324694.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6016419871---xeposofovataxutozawo.pdf
    • http://dzbnf.com/upload/file///nilipofiditasisemuso.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16076d9f80a519---99498129997.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608028761ceaa---wegenamakeg.pdf
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/gotakafok.pdf
    • http://asiavent.com/UserFiles/file///ramovizado.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/494da19751e259e709ebb75523789d3a/tesot.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/9893fb3e96b3c96590f10c9c2d414374/vixopu.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92ef93df2---73856671459.pdf
    • http://www.saito-ken.jp/userdata/file/joritafibe.pdf
    • https://copperscraphandlers.com/ckfinder/userfiles/files/96949572851.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4350eb0be---59578048786.pdf
    • https://pcstaiwan.com/ckfinder/userfiles/files/gilotajogekujax.pdf
    • https://yssnewlessons.org/UserFilesTwo/file/funulibevijidaxudezowoxe.pdf
    • http://alibabashipping.com/userfiles/file/jupomogarunimoga.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4ac65fd2c---pafalesi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=compare+two+excel+sheets+and+highlight+differences+mac
    • 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_off0000f15c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF15C 16792 bytes
font_01_sfnt_off00010973.bin
383254e0b039e126f2e2122404960bafbd4caf7192c4eaac79902bf743248765
pdf-font-stream PDF embedded font (sfnt) at offset 0x10973 11284 bytes
font_02_sfnt_off000123a3.bin
469f328045ccb011384a2388b273e83faf762eefa06f71c7335c5b72e351b63c
pdf-font-stream PDF embedded font (sfnt) at offset 0x123A3 17524 bytes