Malicious PDF — malware analysis report

Static analysis result for SHA-256 a478e4c167710eed…

MALICIOUS

PDF

176.4 KB Created: 2021-07-20 14:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 97b9ec27f2889cb4479546107cc75d7e SHA-1: 76a68c80d1e036ed1c6e05e1f80e1109c28a9424 SHA-256: a478e4c167710eedc03073414e4b58133be47ad2ed77d25a79fae19a568c67a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the heuristic firings strongly suggest a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9474

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://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/joeu0siapuobdq821m5ben12b4/42318512410.pdf In PDF document text
    • http://daikinhbac.com/upload/files/87560674474.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/39207449088.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbbbd25820---21828931820.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/95837465323.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/68436887669.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/8b30ec5f4a25af4cfd34cf9998a2ad31/totisobegoduxupisal.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/posivaxufiguromovapima.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc52023efc---47971094332.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c57335eeb66---24441335075.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/dasolonenipagawovam.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210507163529.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086892824bcc---doxapepujofisol.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/bct30h81n02rd92tbdmrt8jmpk/60766407622.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/48714425769.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608572541171c---82725586683.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/95df88fc0b45bbc1749eac2760693137/91851749369.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210529_194510.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/jazileboketogi.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/60685248325.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/37642872138.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/7dd6cc2a076913a5be1ab199953ab100/17814893080.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/midemipexiniput.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=jesus+the+visible+image+of+the+invisible+godPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00023c55.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x23C55 16356 bytes
SHA-256: 987202d005808df2bf250c94ebbc7293db4d81c3bc8167bf4fd3b475994e964c
font_00_sfnt_off00022444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22444 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000252cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x252CC 24240 bytes
SHA-256: 8b2c80932629e83d8adb5ebb638100ed375e8afca07ba86f75a80348161a8b0d
font_03_sfnt_off0002905a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2905A 10996 bytes
SHA-256: 56438966ac6375b899da95ef6ef9cf117d1271113e4b2d07321f454df58b3c93
font_04_sfnt_off0002a982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A982 2048 bytes
SHA-256: 21f9df20f227e8d8e40da5b43cfddd00bf1dede15ca1231093bca9ffa6c49901

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