Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4177918daa5f8f…

MALICIOUS

PDF

78.3 KB Created: 2021-07-18 00:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0cdaf8f22cc93a92d27f136ee5a9d436 SHA-1: b7ee67a61a3240191143555631fe77c366efb921 SHA-256: 2c4177918daa5f8ffe02646a1383b0da5044f21891cf6659e668d9ab0b6dd4c3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting it is used to redirect users to malicious content. The presence of numerous distinct hosts and the use of disposable hosting for some links further support this as a phishing or malware distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/f724e81ab39dc7784cd3dc3f4d1cdf89/66048040102.pdf In PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/heibske3uvmksllrgls3fllrf3/44154588901.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/7p14evnpjm6ac25cdjcb4ordp4/vekon.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d08062044---puzip.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/25499526729.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccf23ca03f---26068052284.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/62705702eff4aa690d439c8a4894f618/18582675850.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878b3b2c19d---ganugoniwonud.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a088960d18c---98421473042.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021050201583860.pdfIn PDF document text
    • http://iltorg.ru/upload/file/pekazamanexogofowa.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4adf17c391e7aca8751fa588501cdc52/67008386897.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee9085871ed---gasupasilizekagaxiruviw.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/tibegek.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c276c7e37ed---rutawagunubodas.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/52979733996.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///sifizidu.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/76570683784.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/7f605d82ba628cfd39b7e25d885d7665/ruwokevofazafiro.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/6aad71c886b0dac7eaef0f8b26ec030e/86697991756.pdfIn PDF document text
    • https://cooperspick.com/files/gopagavofu.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/38035204557.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/lizepifelaboviliwamiv.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/wodokuzamamibijipit.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/luguwakawozudiwewipatal.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e0cb7de7b---22197501632.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/popazegefuwaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=gravity+tractor+asteroidPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C5 16360 bytes
SHA-256: 4dbde8cc491786d91ce0a6664e72fd6c64103d57a9532da9018885688598f78f
font_01_sfnt_off0000fc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001142f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142F 10432 bytes
SHA-256: ad95543e1a84e41bda197c9ae5d3015ce1a6f76180525eb6627791c786df0819

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