Malicious PDF — malware analysis report

Static analysis result for SHA-256 deed4fed42ba72c2…

MALICIOUS

PDF

112.2 KB Created: 2021-07-02 21:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38a15ba0fd5bf9fed153468cbc4e7568 SHA-1: 11d87233e460938b39f7b40e17c13d4652a3fe27 SHA-256: deed4fed42ba72c20ac29ee53e1ec944c18c719af26783a237d2e20cddede5c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://poongdung.com/FileData/ckfinder/files/20210613_49963ED5DA92C01B.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91f593834---zekilamul.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/5p1ek84h5tctmbsr2p0ioo5p74/rupudunaxikukevimu.pdf
    • http://mamam.by/upload/File/file/ruwiteparebo.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f38e37473---sotokevoz.pdf
    • http://abwplazaview.com/uploads/files/wifabuwusadabudasa.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/263cfae1caaee1019cc55b37a9aad1de/45928734529.pdf
    • https://cordovajewelry.com/images/file/kimorowazawerofut.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/4017f55ada161837e738c3786cb551e7/ziwenogugofifuvak.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/cmpigt24njdqmj1rkdertfsln9/97525614216.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/90b0768ef9791bd2dc905a8fe2a47076/zugamutozitisajezo.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/d880cfe6474675638904b098af2be891/dafagikixapuzogow.pdf
    • https://epiphanych.com/images/file/fuxarexubaxid.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a13b40600ec---rumag.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/0868996f1873d139d3c71428bd06008b/89048254104.pdf
    • http://learnazia.com/fck/imagesfile/zatuwetizinagawopepotiv.pdf
    • http://tubietelbar.hu/uploadfile/25670722190.pdf
    • http://kledingindex.nl/images/uploads/84443829202.pdf
    • http://sahrugs.com/userfiles/file/44355142694.pdf
    • http://ozdoby-betonowe21.pl/Upload/file/50882187153.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a78d83e568---wuribiveju.pdf
    • https://abeess.com/userfiles/file/vodixevixojurokapuzo.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f4209d7e1---55282157304.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/srlkrl7s1tffjth5liidurin53/bedar.pdf
    • http://ambvetfanini.eu/userfiles/files/rajiko.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=attribute+to+god
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013746.bin
9b18c5d29042e82acf532d5909feaf51230cafc58a040588a9a88d8e9e42e04d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13746 17700 bytes
font_01_sfnt_off000164f5.bin
954dda4f77550dbf8c9b09fe997e3656ec44806c3ba52c9d40651e8ef6339622		 pdf-font-stream PDF embedded font (sfnt) at offset 0x164F5 10164 bytes
font_02_sfnt_off00017b95.bin
5c4aabdb1a032cd693b037596247a502a53643e14f21d238d42bada6bde5fc65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17B95 18852 bytes
font_03_sfnt_off00019acc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19ACC 16792 bytes

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