Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92d77a1090a9c6d…

MALICIOUS

PDF

87.4 KB Created: 2021-07-01 22:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eca723ca53cb2cf33063ffa6eb42f3b5 SHA-1: 2e7e3ce9cbe6e83b1e11becde925cb40505600fe SHA-256: c92d77a1090a9c6d4e6e0271e44f351b86d20960539bcfccfb6337e3745acfe8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to manipulate search engine results or redirect users to malicious sites. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/mugokubin.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/835a4f4d268960a7ae720dee8311e57f/3643747178.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/ec0f56eb20646a2682b3595f7876a631/vanerikobosimutaw.pdf
    • https://ctapigroup3.com/contents//files/mexamitevunomadesebewat.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/vh42vq9vdcfg6gbtus30h42tit/rizalulovat.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/4542b8d97a5dc32760fe18f44855f490/44690532112.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a7bf219557fedf39939843cc0eafb6d5/mozuviviwikagegoko.pdf
    • http://alkanboya.com/files/file///bovixaxedevowutatakiz.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/bbd50a92c65d02007a46eb1ef3fa85db/xafutikonaz.pdf
    • http://lab4050.com/upload/editor/file/supelusolo.pdf
    • http://hilltop1976.com/clients/24685/File/pijudivipobuvej.pdf
    • https://travelstore.tn/userfiles/file/bamagagoxaf.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2de5c21b0c07f740220cc25911096c2b/labeviwikejuwimu.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a97f0af60---25481023273.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb65a9d11a---87315763009.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e21e534835---35585189591.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/96b160da20913a755b854c6679dad3ba/woguz.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0ca10b072---mujivotujobusebazopuka.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/c6513225e48b6f42304a17ca5cd406fb/semuvagisexujobomisefu.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078e153e4918---bixoravuwigamozureb.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/51853178b77f4e10939760fc0632db51/vozevebuxiki.pdf
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/97548865682.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bf56e2a6d---3825136696.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/68c51112d8ba07d1c5a886d064941294/xoxuzezoguxiv.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d77b3c723a8---raxopurevitokuvesuxoxawi.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73f9d8bd52---nujosageda.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=computer+related+mcqs+with+answers
    • 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_off0000f270.bin
4ccf58668b1a4a01a55dfbfdc5ab73e05f80a9a2a480d80334fee6029ffd3509		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF270 11144 bytes
font_01_sfnt_off00010c1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1F 16792 bytes
font_02_sfnt_off00012431.bin
1e29a6f7ab37bbdfe290a7e7bba32711db5097b39cb61d352dff47a3587c206d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12431 16888 bytes

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