Malicious PDF — malware analysis report

Static analysis result for SHA-256 e12fbd44ec77a990…

MALICIOUS

PDF

127.0 KB Created: 2021-07-02 20:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53e0c70c04611e8dd1e1bc43df1c2f8c SHA-1: 5287d26e4f8e6438a761afcf0a89556577637c36 SHA-256: e12fbd44ec77a99026fd58907393e3d78ea30a66c3109badec4a983ae2b609e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the link farm and the detection results point towards a malicious PDF designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

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://laborke.ru/uplcv?utm_term=177+meaning+in+bible
    • http://all-pass.com/folder/editor/file/dogabebiliwobovuwibu.pdf
    • http://www.anjhimayath.com/upload/file/jirejevobo.pdf
    • http://bizbecho.com/pa/trainstation/uploads/image/file/ximalemuritidov.pdf
    • http://cuatro-pr.org/sites/default/files/file/53630889634.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-16/20210516203425852275.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/zajovopiranosodo.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b180fba23a8---wavebikobesos.pdf
    • http://hanhthien.net/uploads/file/47701515765.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/1c576u2opgj30m2o39ekms4q33/28588038192.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/05c59415e5386720456bcc4fb558e9ae/90244161591.pdf
    • https://circolodelpistone.ch/userfiles/file/54281864067.pdf
    • http://szao-spb.ru/images/news/file/makaxuvaritipid.pdf
    • http://andrelandberg.com/userfiles/file/99008182931.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9bf7c9c5f---tesitebawofemumibokowe.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2ccd791d2caa5c7e3e0fcfb573439143/xigigomifodolejitig.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/a2cc439e84a6d26ae499aae9fc50b457/nokevusizim.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607418ff6724e---96812752648.pdf
    • https://zlatartopalovic.rs//files/biwuzaf.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b21d33a6a74---malibufuke.pdf
    • https://acronimocostanzo.com/userfiles/file/lifiwopejewapuvazun.pdf
    • https://afra24.com/basefile/afra24/files/5750569613.pdf
    • http://adria-ex.com/images/blog//file/76487362088.pdf
    • http://www.anclupnapoli.it/userfiles/file/xegaziwisededimukiteme.pdf
    • https://khotelmarket.com/FileData/ckfinder/files/20210609_AAE1994FE6D3BF71.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b105e82e0c---gogidamilamatubanezuko.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f0d77f567---89514679346.pdf
    • 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_off000170ee.bin
25f92c56cb426d55dfd5541d4aa0ac4c99c1c983f94c336c1b402fbc6b74fa66
pdf-font-stream PDF embedded font (sfnt) at offset 0x170EE 10112 bytes
font_01_sfnt_off0001876d.bin
d2ed8deb50520429a2296d267faa865091a97d42f80f78c084161c104fdbb644
pdf-font-stream PDF embedded font (sfnt) at offset 0x1876D 18480 bytes
font_02_sfnt_off0001a528.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A528 16792 bytes
font_03_sfnt_off0001bd3a.bin
b00e3f8d17c906a33d667e5abe92574115b9d3b3c422dd082a52888745a60b11
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD3A 17984 bytes