Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1528056ebdb0f5d…

MALICIOUS

PDF

72.3 KB Created: 2021-06-18 20:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b583e5174779ee331c7680f8242300e SHA-1: b43a61b3c9270c44ad9bc36dc229ee6d9f8e0ec7 SHA-256: e1528056ebdb0f5d2bfbaef3c44b96c14a09f92bff4da6eb3eb67c72555472b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites, suggesting it functions as a link farm or redirection mechanism to host malicious content. The embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme disguised as a search result or download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f315e9d7f1---82785603618.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/8qbskbk4lq47kk6iimqmjaus62/81002811253.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/795da9b2dafd85528b5fabb600bc17af/53198084872.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098746aa7fea---pujinefofemur.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083112f6fb9b---83679163288.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095da6d4dda3---fepubimibab.pdf
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/44268202996.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/73ef5306ad371d0cd47ccc26e8da2f4c/58709335062.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b1913bef1c1---20895944636.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/pj5g8mb9rpm2clg7nmegh8c92e/golenataposovebosusetogol.pdf
    • https://ancoraeducacion.com/images/9614802378.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/758acf6a9ae2bc8341de79263c899991/fuvesudeb.pdf
    • http://www.sport-konyv.hu/userfiles/file/gujinetevegesanibo.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160cabe57a21d9---zogilazopago.pdf
    • http://accessprecision.com/userfiles/file/detusexibetekagojekirep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=hill+climb+2+racing+mod
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de52.bin
fd10f6ce92a18ea1a5d547863bbd5edbb00608971c6b491cb57657cd71b1383f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE52 5312 bytes
font_01_sfnt_off0000f043.bin
483a9647016626674b312d6e3e316a72a16c51364b57bc50793727b4093e22e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF043 10672 bytes

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