Malicious PDF — malware analysis report

Static analysis result for SHA-256 5521379af0278310…

MALICIOUS

PDF

102.7 KB Created: 2021-06-30 12:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: eff0a00546c1dc13ee6d69d7f8e7eca7 SHA-1: 95604103250e3c01b0b985407adb44dfb9b11638 SHA-256: 5521379af0278310bbd7122d0416c85a5c8eca7100971306fc5165e3082e1248
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised websites, many of which appear to be WordPress installations used for hosting malicious PDFs. The presence of a link farm on disposable hosting and a URL with a 'utm_term' parameter suggests a phishing or spam campaign. The file's structure and the nature of the URLs indicate it is likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=nerve+cell+is+also+known+as PDF link annotation
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/1ae4f5a69b64938be95570be8f0944bd/patubowiwamegurozovav.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609638a86b809---kixizuvupuzedawi.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d053204086---33297437905.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/13501177152.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/77qtubq2doj4v20vm6n07hcfii/gozonujinesi.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a3aa6202c91---gegenujorufitedijademik.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/dumamogiro.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/c0d6515ba18a2d91ed68d8e8dddf663f/kipexo.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/bffc55d1282a3dfbae4a5cebd10e8a7f/48070019241.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/ac0991798855f6a6614ed17e3ce3c3a7/likisisevagox.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/kiriliti.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/227c465aaf1d06eace6e93523fc523f6/14084650986.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/tt9bgkarbak8bd78phqck67gjt/26418817888.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/a2fd54feebd02a9c0155dcb788abdcd7/zakezaruzaluvejuzudopixup.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75a270ba69---10099064988.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/1896519a3fa60548686be4f018768f43/69169514167.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b92e6197709---61379939404.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8f0062407---funer.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430020944284419.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093deccbcf62---ponexipof.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/c635dc615e9c39fff7535fc71cc28f68/50035806234.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/9lc9rai14q7k8ckgrh2jb3csl8/93058120611.pdfIn PDF document text
    • 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_off00012e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E81 17768 bytes
SHA-256: 990ec2919a64efb1c7dc937254b001662f4af8195fbbe924351de4a5338a5e3d
font_01_sfnt_off00015c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000174a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174A8 10344 bytes
SHA-256: 5eccf943bd8363ef1c36462f4a064be7aea9fae521b92d206d31fde2190c152e

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