Malicious PDF — malware analysis report

Static analysis result for SHA-256 6406afbe33c63c7b…

MALICIOUS

PDF

88.0 KB Created: 2021-09-13 20:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 47362108d3c597430ae699bbb5bba320 SHA-1: 6237fe3d2b9b20eeabcc61268a1800b47487c46f SHA-256: 6406afbe33c63c7b0253606e4c7b463cb2a4cff95493bb1b6beabe952c723025
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It contains numerous external URLs, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://pixomot.ru/uplcv?utm_term=app+store+optimization+android PDF link annotation
    • https://oykufestivali.com/ckfinder/userfiles/files/semozulupotaxinunavonuwer.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/3f7beb80fe0a2caab1ba279ef52accb1/33390586582.pdfIn PDF document text
    • https://arerp.kr/data/file///55039829305.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/60026977123.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/xibifavubajobofu.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/85107179373.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/47842122813.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/fufapizedigovorumesib.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/lofulezatufejugabo.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/xijogov.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/2u0vuurobu6vo1krioqotlp3ti/18339100908.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/dawupoj.pdfIn PDF document text
    • http://1careglobal.com/upload/files/kiraxoxijoreset.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/damosopokudivep.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/2728740711.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/waferenafirugunubilo.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/gisodan.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/teloluvujunonev.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/84a5f85316b501e9f25e4b247d0a5917/bujosakajimezigatolinetu.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/2086416672.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/81726494302.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_off0000f45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C75 10548 bytes
SHA-256: 337c691ae46e26694324303a1e3ff795c88076e9edc4d40a28f093cc64610035
font_02_sfnt_off0001248f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248F 17876 bytes
SHA-256: 8539149dfb1429ade11b4b581f4756d6c35688375c02b4f056c560c5296f5927