Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20ab1a382d87f22…

MALICIOUS

PDF

78.3 KB Created: 2021-09-21 14:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b389af7ee12a5f19f65ababda8e25e1 SHA-1: d77c96891d7b649fc7f129d449602d5b39a382b9 SHA-256: f20ab1a382d87f227bf5521e2b5f5c02815c512774447e1ff6f6df0627e1db08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains, some of which appear to be compromised WordPress installations. This structure suggests a link farm designed to redirect users to malicious content, likely for phishing or to download further malware. No scripts were extracted, but the overall pattern of hosting multiple malicious-looking PDFs on diverse domains points towards a coordinated distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://canoeing.by/pics/files/19575129544.pdf In PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/ff483d664f7b4e409112deb38acb4aac/6315829090.pdfIn PDF document text
    • https://natinsel.com/imagenes/file/sawonumufemopepejuf.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/26278138362.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/4515937263.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/55251821984.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f305aaa0e4---53786797320.pdfIn PDF document text
    • https://suksesunited.com/contents/files/sejujam.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b430b14e8---91028347455.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/bopuxadobaw.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/79519702968.pdfIn PDF document text
    • http://plise.org/userfiles/file/dudutibom.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/50800084287.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/mafekuzibunadozibu.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/mibegiragejiluva.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/39804361596.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161465fbc2254c---tijukibotu.pdfIn PDF document text
    • http://entrackintl.com/uploads/73088741876.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/dukapox.pdfIn PDF document text
    • http://www.heksan.com.pl/file/57174385642.pdfIn PDF document text
    • http://aven.su/userfiles/file/fugetinowibubil.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zefugum.pdfIn PDF document text
    • http://njchemland.com/upload/files/jonifulivesejig.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/minorevajadiponezodonef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=anonymous+we+are+legionPDF 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_off0000cdad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C4 10636 bytes
SHA-256: ea841e0cf29f375dde11376d2d98199bcab7cb22acb733a988b9e8db886c9ce6
font_02_sfnt_off0000fe29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE29 17380 bytes
SHA-256: 8f55d20ad296b4ba8c048c7e63437688c8d1fadd9b851594561f9ca5ef865b84

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