Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d5db2854e9928f…

MALICIOUS

PDF

88.3 KB Created: 2021-07-04 05:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5312e4a2b8090b2454256b7641752cd4 SHA-1: cacd4d777a8467d95b28e2c59ce3fbf297a49ca4 SHA-256: b4d5db2854e9928fee4498c9810172c78ac4a05a00473a43986ea219e7905448
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to obscure the final destination of malicious content. The presence of numerous URLs hosted on various domains, many of which appear to be compromised WordPress sites, indicates a phishing or redirection campaign. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a563a3ee3f9---95643832097.pdf In PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3b8653b34---mulopodu.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/51688780648.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/zefewekupujaxodipobeveb.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/48566835649.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/29988678866.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d093f0e76---lezanuxex.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/9526875711.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/d2e51d421cdc2f3068f194bd3c20b333/zifatugetin.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/af85382d03f5f0cc72a3b75d27303cde/49895602821.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c37289352---kugowavoxumi.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/21365868878.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c88bf79d17---22146013118.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077fb0772b0a---bujinafesumivalawer.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f36405c777d913407b3943e4abe83be1/58370054145.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/lazomedoni.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092fd43da9d1---bezokevexozozu.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/03c651f65b08cbef03a22ad83cb353f5/rogifokojunumigilobog.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/90a5722a727afd1497df5bf21bdd0255/fuzasavupibutawekonofil.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/7767243511.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/74865257668.pdfIn PDF document text
    • https://isleo.com/i_photos/file/fazasuvuximomolivakewemuj.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/5205759924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=columbian+red+tailPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF583 10512 bytes
SHA-256: f64b57d96d13463e7b7b36ebcb17844ec359ad804166f7b056d0a7520e23c50d
font_01_sfnt_off00010d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D57 17396 bytes
SHA-256: 8c2f4e90fceafe74e74280645ae51cd55ada8a6e284288a6b2b78677c713d754
font_02_sfnt_off00013ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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