Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f53b52b15322e2…

MALICIOUS

PDF

96.4 KB Created: 2021-06-25 22:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c1859bd1a14cf15f2ba5c56faf4158d SHA-1: 2e771e564651e4e4518798d326978b3914a20422 SHA-256: a4f53b52b15322e2fb4c80b4068ee8a92d2cc3260c09620aeb0138d9953628f7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of links, many of which point to compromised WordPress installations. This suggests a link farm or SEO poisoning tactic, likely intended to drive traffic to malicious or compromised sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/c392e531eaf7163de459f24accf1926c/pazojamunopetujo.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/fbdb4be60c583ff1ab6678a412da1976/ripikeburit.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/1bd58b9aaf36b8e0dd7c985dc64e9800/xugama.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070371e2ecb5---dabasupavafepijar.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/28967a89c40f3cf700620a78667cabfb/tebewudorifuli.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/ac6f073af19f826aeeb5c4d660320c3a/92675811542.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64f5950a24---fapebapurezebawurigifuta.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb89339d91---jemafexo.pdf
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/95749284717.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/63294caf8bd6d5d640b79837b2322ebc/6318597853.pdf
    • http://grandp.ru/userfiles/file/lilatetugamarobetitifu.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0737a92d8---wuxaditoxuzijetimudofakiz.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607a97b7461bb---24233174586.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b778bdc0db6---84766719321.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160861278ae664---sopupozowuzarov.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/b21cdc784a4bd1a3053f3c8ddd31ba53/vitozefav.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/aedk1q60jtoa5sv70gv9jp2o7j/toriwugadovubigivelazoj.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/6eeaf4bcc0da50f4762c3f95425dbfef/58320531324.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4fc400cb3---34590063053.pdf
    • https://fasaac.org/temp//files/ponibosoporizademobi.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160829d7962445---49755101235.pdf
    • https://calmoinc.com/upload/editor/file/27726901764.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0bc44c924---tukitosatokejodu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=infinite+sequence+examples
    • 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_off00010e22.bin
3a7ac3aaafb9dc614a2b1b559e42b9675b98914076c09696511f321738973dfe
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E22 10720 bytes
font_01_sfnt_off000126c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126C1 16792 bytes
font_02_sfnt_off00013ed3.bin
d5260b12a057c373e555c7c2c126cac31da8e34ecb7cffbddcae603f9b491789
pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED3 20812 bytes