Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b7c01c1c5a90f8…

MALICIOUS

PDF

91.2 KB Created: 2021-06-21 06:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1a012a78bab2bc499d6e462859b32570 SHA-1: e4fb95cddfd34f8ad2d84b751cdd5a6d571c7ff5 SHA-256: 78b7c01c1c5a90f814cd4d962b71df1c7b24ee48c46c15192521597ffe6d9219
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress upload directories, likely serving as a lure for users searching for specific content. The presence of multiple external URIs and the nature of the links suggest an attempt to redirect users to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://irlanc.ru/uplcv?utm_term=shia+amliyat+books+free+download PDF link annotation
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/a20d8f6c19122986bccca4a1a44f5f02/77333537185.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/34178017136.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16070a907691f9---bupetonikivukobifivajekuj.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/572d5397657be0c5af8084f25c816ce1/lazanewajetiludevewotokil.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608491e8099b1---surijafix.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078badb2ae9e---9782796360.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/liwopepibowipu.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/e59a4ca50fcb6247c85c062c674c1e4a/lezevipizimuzijisuvowox.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/090c3391fc51544356eac9a48a41ce33/milolenifenowagiputi.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/38053935551.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d5b08dfd0---4211147361.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160afa948868d3---dudedeboxowikufapawamozi.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/714e9f5a6202d75c3b3fa30368f0323b/tuxojizufufaxujotus.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8ac92157b---vifulifesuzorixonufujebu.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/95694581c3f53f85a4982186e8f5190a/805772617.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/lugadigererusaxesijijozu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012a82.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12A82 29060 bytes
SHA-256: 9248d6028563ea9d7dfae128c79cbadc2d95b44a563bd5cb744ebf6c0a944a9e
font_00_sfnt_off0000f1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D0 5648 bytes
SHA-256: 9182696ee085f10ba2f55823d9aa34f33d9b9216597b80546534c7f8305a422e
font_01_sfnt_off000104ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EC 10976 bytes
SHA-256: 267a5beecdd2b06a61018765930427fb1d2346ed7ff0c333fd07d6e81f148f0e

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