Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a0b984b5e1f994…

MALICIOUS

PDF

100.7 KB Created: 2021-06-30 02:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e5f6f050d2d7b29346d61f7dcde9152 SHA-1: 60acc621864f17c60d6100d6a4f6eb0cc8ca8b3f SHA-256: e5a0b984b5e1f9949ffd442cbb1faa1e0688a37f978f54f2ef9a531c4a57f0d6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body was unreadable, but the presence of numerous external links strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://chinocorporatechallenge.com/clients/6216/File/lijudi.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/4lrhmh3lsvfmmd2gcbgjg5lqfp/85723495846.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/70e2954664c02eacf563e4cfa49e79df/guzepedubulakevep.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/015d258fbdeeff9b1603f6e1e6333ddc/11134450592.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/66ca950ed51cbf5740b4053535578faf/zajokij.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a296b41d446---31714722170.pdf
    • https://camgloberealtor.com/userfiles/file/fosukaf.pdf
    • http://ever0036.com/assets/uploads/ckedit/files/20210604114315.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/0f91a680b94c88ca3f209c1718421df3/donowojagulobosetolo.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092045106c07---92940556565.pdf
    • http://jedwines.com/cmsCart//upload/file/vutezazativafiwuxidisi.pdf
    • http://articolo17.it/siti//usr/foto/files/6309511123.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098c1601be4a---kivimasetaranadutar.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/da2363f321a04171e39274af5b61d18a/39690577103.pdf
    • https://local-atlas.ru/userfiles/files/60692174585.pdf
    • http://ingmontagna.com/userfiles/files/84647271193.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/cr0jpqhcmbt624g0hn22sj3t20/jobisenureku.pdf
    • http://manavpublicschool.org/manav/userfiles/file/6019411109.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d3c4303a4---53553776974.pdf
    • https://carparts-fixture.com/file/file/89524810492.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/87acdf73261b19b48b3ac813c9bb7d87/193015730.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071de8cb1ed7---fulimojuxuzepenemavoweke.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac77d81590---barawuvejafe.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/972e6ca646341e608542e55c3e66cf25/68228241583.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+equalizer+series+queen+latifah
    • 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_off0001261c.bin
6165a53f54e226304dbe1c68d45ff4a507bd8e7e01a6fac7d32c2c727a853d43
pdf-font-stream PDF embedded font (sfnt) at offset 0x1261C 10460 bytes
font_01_sfnt_off00013dce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCE 16792 bytes
font_02_sfnt_off000155e0.bin
0bae5064e27dfd9f0cc8f1fc49a50fc1964f88223b51c293e8e7442517f96ab3
pdf-font-stream PDF embedded font (sfnt) at offset 0x155E0 17952 bytes