Malicious PDF — malware analysis report

Static analysis result for SHA-256 d031bb6629cac5f8…

MALICIOUS

PDF

74.2 KB Created: 2021-09-05 08:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9a8ca0a4384b645093ae580db89965be SHA-1: dd4d8862d9dba5830ff6c1ca9e86fa59515b1a39 SHA-256: d031bb6629cac5f8096fdffc8944bc1e823957f3f2bc44cd199f1962cf58a4b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host further PDF files. These links are designed to create a link farm, likely to obscure the final malicious destination or to distribute phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, with the latter specifically identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=break+up+pdf+into+pages PDF link annotation
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d2627cf1e---18851249247.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607809ac5a9f3---foniw.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/2206929333.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/84053051055.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/13532249069.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/88556741560.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/joxas.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/0de3423954c1686dee4dcec63a2f818c/33314271492.pdfIn PDF document text
    • http://msamericapageant.com/clients/873634/File/javememojeronij.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/55735846107.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eafd77aa0b---65461080705.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b55a25ee5a4---tevosoruvimilawaduge.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/bp33neapcm885jigs5orm85fm4/22556474738.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/tavezasagez.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/71157279127.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/pifanubupusovesoxola.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/duzakaw.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/fexabem.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/tilijurixatepadezo.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/21813687747.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/90221533356.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/68871686911.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c030d8fa64---sejufefujesituwuritobej.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/mudijuxewidanikazaxozawuk.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1F 16848 bytes
SHA-256: 910ebb48d5633101b6873ee670a5b0d71a226bf49aa96aef7cdfe97c4103264b
font_01_sfnt_off0000ea94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AB 10872 bytes
SHA-256: 93cc56cfa3d3b0be87cb78b8eb707de666048ec458cfe6e995f9f78a5d7f7177

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