Malicious PDF — malware analysis report

Static analysis result for SHA-256 f331441c156b1aca…

MALICIOUS

PDF

93.3 KB Created: 2021-07-18 10:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8fc629debf06f32442edbfac71c814c2 SHA-1: 19ba7c6fe6aa61f8ae1e829db9011312e4028292 SHA-256: f331441c156b1aca8c6c050587668b923ef977468a8a32d09de920e6d8b9ea1d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, likely for SEO poisoning or distributing further malware. The presence of external URIs and a link farm on compromised CMS upload storage strongly suggests a phishing or content distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://tgtech-auto.com/userfiles/file/razorifuzune.pdf In PDF document text
    • http://www.css-jp.com/upfile/files/2021/06/17/kuxunamozoro.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/potus.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/zipowuwe.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/57837884986.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/zuvirovexusidoribasutizo.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fb764d600---xobarukovanesemixizow.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210521162160263813.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7e667a89006414b8716838382663b1b3/vuwatelejudigu.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/suwisaweluwaboke.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/64573285530.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/22423792892.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/xezepira.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/50776632857.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/68966b44d2cf55dfeb14adb68492960a/13021332000.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7b6f883c0---nesekobanovus.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/g4codqvpgd4vi0216nj5tare32/77320540275.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/9c6b1cb630c8150af03245f8e95961b1/rizopuxize.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/1e33c783f0fb5987f6095d723b94c3d7/lijizebazenog.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/c6f21086ab5da2a9dc0ea72bcec743ba/10985139708.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080360ac362e---sosugadanarafutosonuvad.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/f27c379a02e6e11c55a50162655d5d16/6719960010.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160f0a8d82bec4---xozite.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/danaxamegekuwuvolasomise.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/4057309748.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dd2b2d8a8---fuvozixevimozazijozule.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/5b366b160d0467298cee1dc1342850e6/72192498279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=oracle+soa+interview+questions+and+answersPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001215a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215A 10788 bytes
SHA-256: e8b96d6d5d6396c77e843c8577e15b8dfbbc0aa3a24242967855705e7c438272
font_02_sfnt_off00013a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2E 17360 bytes
SHA-256: 73c017506c646371ac2d6ac4901170be52d9646c40d13ce3bcb0aa621f7c0297

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