Malicious PDF — malware analysis report

Static analysis result for SHA-256 6159aa39352791e1…

MALICIOUS

PDF

84.7 KB Created: 2021-07-07 12:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81567714533748ea4e5b345889978342 SHA-1: c284423905328d4072d1a114c8ae683f4d4f45f8 SHA-256: 6159aa39352791e1c37d2d61bd9f1307834fd5dbda7035d9470a744a11caa1c2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or to distribute further malware. The presence of link farms on disposable hosting and the use of UTM parameters suggest an attempt to manipulate search engine rankings or distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae439d03150---saburupopes.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/h490jh2791ter2unap77lgb6ee/maxizujuzosizefifimip.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eff84d1ff1---puxofol.pdf
    • https://angelsstaff.com/uploads/file/59826433170.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609849bbc72f0---78343726994.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f256e3f89d---42905266823.pdf
    • http://msslink.ru/userfiles/files/79477251318.pdf
    • http://spreewaldatelier.de/img/editor/file/37625436356.pdf
    • https://menu2uplus.com/images/file/bexif.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608433d57c35b---pawenasap.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7674b0254---tupapalojukejine.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/950tvh4mbel0h5a22fj7c6cko4/96046561167.pdf
    • https://sasalidayanisma.org/uploads/file/fumekatajaninuderikuwu.pdf
    • http://zuche0551.com/upload/file/ronopariwebokenevolitis.pdf
    • http://loscogliodifavignana.it/userfiles/files/tifusixumenegevu.pdf
    • https://alibabaoman.com/basefile/alibabaomancom/files/79083760969.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/da50nf0clk0h2cq35i3hskbihe/gorigaxuwudovagidivonuda.pdf
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/40862009635.pdf
    • https://livresdarts.com/ckfinder/userfiles/files/ninanepa.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/dbf4c45e99909cf5e7edf2fb663caa5e/kiwapikukeket.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/938b4ef15a07502327052f7d1206b3ff/5945739382.pdf
    • http://digifast.cz/userfiles/65442460877.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=harry+potter+and+the+deathly+hallows+part+1+pc+game+download+utorrent
    • 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_off0000e641.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE641 16792 bytes
font_01_sfnt_off0000fe58.bin
e1fe22bea4af60c5ad04a8aaaff002f2d404b42655e2d07b0e49eb5e35f9a7ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE58 11212 bytes
font_02_sfnt_off00011853.bin
043bb9cbc52c9d2aa3d914066f6b951cd3ce43a96aed561769b2ed862fc74c2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11853 16416 bytes