Malicious PDF — malware analysis report

Static analysis result for SHA-256 227f74ae880a5b52…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 11:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63af58b6b8240abc710b5594c7c33eb2 SHA-1: f403064298bced9aaf2ec56f180dbd71fcb48cea SHA-256: 227f74ae880a5b5266ac119a0c8c0913b8170bebc074d06f73cadb0d578439c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://drafthe.ru/uplcv?utm_term=python+for+kids+pdf
    • http://booklandbooks.com/userfiles/file/jubanupu.pdf
    • http://alarcon-v.com/editor_upload_image/file/lukeginafuzexukutune.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/657867cb7c1a69d3af6078de3275d6b1/24829479656.pdf
    • https://dodatnojamstvo.com/userfiles/file/waganobimero.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/b250befca815230b267d1ffe28ab7760/luginetemomeraxifowosow.pdf
    • http://pension-erlkoenig.de/img/editor/file/pevozurenabivejepag.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16127cd5fbf402---bifolefebifobe.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210528171908.pdf
    • http://www.gabrielamaciel.net/images/content/file/30112663533.pdf
    • http://savitaco.com/uploads/images/files/ganaxij.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113445a324b5---jifiluno.pdf
    • http://baiduvpn.com/upload/files/fegidujamaxomafazusolavek.pdf
    • https://machinex-machines.com/UserFiles/File/sabupig.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4cff88b9b---35099469468.pdf
    • http://dralituncer.net/userfiles/file/tevikowaketuxaledabose.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/df60212f70ce32b48a264598787bd128/zosedeninidufuk.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/f319e9d10728a830fa9d4dd06c594b13/gogosudugekafowujenamu.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/3ea0eab1e2012d6b510b6ab21a19503e/74152862250.pdf
    • https://soalmatematik.com/userfiles/file/71241835467.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf5f7e24e8---powesasiwimefivumaga.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/7t25k4it5qn4rjvd1ua2mh5rvf/jaxivesadar.pdf
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/83885775164.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae818c06e91---46147777557.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc31.bin
9dd177c39bdbb1039000f77a0b0c0b420acd3cfee0aa83e90ac83f7c22ad62e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC31 17536 bytes
font_01_sfnt_off00010a18.bin
9a37195a118d3353220fed32068462c56e66dbd6b02b71a343a1348fce44acbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A18 10460 bytes
font_02_sfnt_off000121c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121C5 16792 bytes