Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f240a73da5dd17e…

MALICIOUS

PDF

73.8 KB Created: 2021-09-25 04:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1776f8c2b8d32e3435fe15b6ab844b51 SHA-1: 49e4187b52c84a76460e26d513fb2a7baac8777d SHA-256: 9f240a73da5dd17e2539d2935e75c8ad986b3aa954b26810f918ac601cba9b41
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=android+apps+installeren+op+sd+kaart PDF link annotation
    • http://nicolalazzarotto.com/userfiles/files/88566521336.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/2075553544.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/lititepodubakexuserugam.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/deriwuvifim.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/67887895939.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/30004761577.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/78786432963.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1630809177963262803.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/mivub.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/tetux.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/kimagugipuvigevagugux.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/ridotugodoniwa.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/44329410525.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16148f5eca2c5b---32981495195.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/qhnacor7mp6hophple78t7jjr5/lodef.pdfIn PDF document text
    • http://lulanjina.net/upload/files/jiwiduzojejugowaxevusuji.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/wanurukerivenufebekizege.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/xawisadixanazoxavagaz.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/36411174472.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/2b6bd80d7fec639a7134e8fa16da11a6/86259008192.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/nexeruludimo.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/varalikif.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/sudikimomilifutumujo.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/lowagijop.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5D 17724 bytes
SHA-256: 847933b0423a4de5f4770adaabb1293bc0afb6fec0fdecbe972904431e1833e1
font_01_sfnt_off0000e9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001020b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020B 10456 bytes
SHA-256: a61ab26094061ee77f34062b7b4c2cb25397045ad7a9d4a17ba8caadb33935ba