Malicious PDF — malware analysis report

Static analysis result for SHA-256 c091489b1c500ca0…

MALICIOUS

PDF

92.8 KB Created: 2021-06-28 21:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6de6f4530a6187d37ea838607f7edc64 SHA-1: 10539575a01bc08b77e6bdbbaf7d2be45ffb1f50 SHA-256: c091489b1c500ca04a8828b3dbb7b513f3fec707ce118fa4ec532d205e100690
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of numerous links on disposable hosting and the use of UTM parameters indicate a tactic to improve search engine ranking for malicious downloads. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16092e4774fe22---33904143389.pdf In PDF document text
    • http://adabaskimerkezi.com/upload/file/70973384780.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/lovugobevefupolumewuxobi.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/nidaxasanamudi.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/6790b3db512c129bcc8a9c2894216a87/61688372492.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46a62b56d2---rulupilujomofawuwetaru.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/p78r1smkkq8jcbdm182gea2ttn/tifefinesukurobegixege.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a03082184f1---napejidozuzu.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/sabiw.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc9ee99515---91688855066.pdfIn PDF document text
    • https://vestol.bg/files/file/76379073812.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/32641297583.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/47e59f47304a9a72daf456ddf5d3f45e/wisije.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/1321821307.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d184cd534ef---vekejetovujunilu.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c515107134f---45312588875.pdfIn PDF document text
    • http://goref.ru/files/file/35548479990.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/98156864138.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/73944548849.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/cdb5e75469a5aa8afae687cc4e853be5/gumepebikida.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/86826587873.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/nlbgtflkual7i0smidd58umr5e/mobafasedafijak.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cafed7da494---girefu.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/fa16af5320e2597c2af0285021a30e58/31665165666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=free+download+descendants+of+the+sun+ostPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/fa8727de32d1508028d3008f44d88ea4/50515227765.pdfIn 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

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE912 16780 bytes
SHA-256: 93357c17d2c9d674e3253f8c2bc8c40d7439d89cdaee8d324744982472cd607a
font_01_sfnt_off00011513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D24 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off00014260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14260 2192 bytes
SHA-256: d2cf5323344f9731f783aa9b34891a82c1d34da7290e19d4e1b324d956baa2ee
font_04_sfnt_off00014c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C32 10644 bytes
SHA-256: c25d9e5640eda0dd63edb66b32d5ad7b49b8220fc5fa31875fd70d10635cb5e5

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