Malicious PDF — malware analysis report

Static analysis result for SHA-256 128cbc3787adad68…

MALICIOUS

PDF

86.6 KB Created: 2021-08-08 18:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c51c45a2c7c3fe80092abd63e427fa3c SHA-1: eda9b85fdb57e88accd69ab29fa6c83a8a292e7e SHA-256: 128cbc3787adad684a66cca51b02970af10b221a3074fef19d394e9ad00d7bfa
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 indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, pointing to multiple compromised CMS upload directories and disposable hosting sites. These links likely serve as a lure to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff4255a8fa---50492325413.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/146612cef7f597132e3d39e6bcf8f10f/gosatupinasobatemigukajeg.pdf
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/92936322958.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608516a6b574d---meluwuwebonavud.pdf
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/nebife.pdf
    • http://velocimapper.com//webfiles/file/82221608281.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/s6epnng611egg0sfmm7k0b4qqr/fefidudenogedaguwojosixib.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/359fe64dd48d08040603fad236bf51a2/xazogadisilabizotaxokezen.pdf
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/68636249582.pdf
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/vumijexoperokaf.pdf
    • https://www.aukuras.org/ckfinder/userfiles/files/37139754872.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/4f5fd19df8c73ff3b0e20ac5a26120e6/betorufo.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160908faf55a71---roxategododagudevij.pdf
    • http://kientrucnhacuagio.com/upload/files/62122825745.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a79eef0e5b---21004806043.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073f7c66152d---gupufomuma.pdf
    • http://fedime.org/imagenes/35181004667.pdf
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/lufabefo.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/i6mhnaolemohf3l2ff6vst59tk/nafilofovowipisotakage.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad1e547696---64645988841.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b2d46e115083f947ab4afde03139c6eb/siwodefaso.pdf
    • http://casinodanmarkjackpot.dk/userfiles/file/85234701867.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da0419df9bf---43140544670.pdf
    • http://win-sonic.com/kida2018/ck_imgs/files/43844020867.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+do+i+view+photos+from+iphone+backup+on+my+computer
    • 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_off0000ea7a.bin
b56a4dd0db87e1f7bc86475048ba76615f1874646cace2624012972f41e0f8fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7A 11428 bytes
font_01_sfnt_off0001051c.bin
e61ef153ce709ae74bf87f48d998481d7665884614c6969910df9d2e278aa2c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1051C 17944 bytes
font_02_sfnt_off0001342d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1342D 16792 bytes