Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e27ba1c87e4165f…

MALICIOUS

PDF

74.3 KB Created: 2021-09-11 23:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 19da7f83ffd744b21d8c0968841fbf2e SHA-1: ed5d43904883fefc3772ee72b64494d6dc954b34 SHA-256: 8e27ba1c87e4165fe807da094ffe295ade5e0564c8b5cd33d33c677da913e0a8
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on what appear to be compromised or disposable domains, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://tlumacz-bialystok.pl/pliki/file/mujobezavejevogalu.pdf In PDF document text
    • https://ietc-oman.com/userfiles/files/73866866646.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613326a0eb712---ginedazekam.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-5/20210905065031518231.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/kdtirhfiasc7erp0gfvm38vev4/wepujinituwobabilebe.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/96798238634.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/bixitemusi.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/93402636026.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/96066199897.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/xepewifubejuja.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/zowobet.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1214dfc14---83423803448.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/14093180585.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/saxoroxebugekumuwo.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/58159412953.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/02/rejezilupategosinubava.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/65252857396.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/88715970166.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/4443026355.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/barimelomejifak.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/43128431277.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/faxoza.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/64512740818.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///dokusugofevatusadewipimot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=android+connect+ps4+controllerPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DD 10404 bytes
SHA-256: e55151f7943977c34c5a71f723484b507f39266955ff18a370c05332bdd44bca
font_01_sfnt_off0000d88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 16508 bytes
SHA-256: 436270cf5d5587c7b039bb60b538e5ce9a35b2ae36a512d37b440cb58953f8c7

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