Malicious PDF — malware analysis report

Static analysis result for SHA-256 432189da985e7007…

MALICIOUS

PDF

82.6 KB Created: 2021-10-18 05:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5f4574f146a070c56da3df00c2c4135e SHA-1: 9cd0d308ed937a3a572dfd05985419dc600a2d43 SHA-256: 432189da985e700791ef6b321be4f48c4e06d384b442cb5c61b23a18a15f860a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links are likely intended to lure users into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://drafthe.ru/uplcv?utm_term=user+manual+for+canon+7d PDF link annotation
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/13ac01ab2db0045a53fec06951944da3/48929956785.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/e9d3222add6e433c3f639fc7d9ebfac7/jegod.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/pozebure.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/fuwinuzerelakewozuvebezi.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed0528beda---81155325677.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/92153947694.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210921000604.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/wokopubavalowomow.pdfIn PDF document text
    • https://arerp.kr/data/file///jigew.pdfIn PDF document text
    • http://serting.eu/userfiles/files/piruzixativabotosukesedop.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/96293284331.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/77863883528.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/71769857281.pdfIn PDF document text
    • http://newshop.jp/archive/file/jasaxek.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/l3nam17ioitmo4t76u4qk7o1ss/fikigitamar.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/jeliripev.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/19052400882.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/soridalake.pdfIn PDF document text
    • http://computerdoki.hu/user/file/90431939767.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/gegagexezemirejo.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_off0000dd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD97 10604 bytes
SHA-256: ff5e2ab48845739074bc8e14e2b08530daf7f9db0612d5b57776b8b8e60f74b1
font_01_sfnt_off0000f5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DC 18152 bytes
SHA-256: 1442b1bd74e57a73cf067c97d41c10627ba9db729d4fb1fdc1332883303898c4
font_02_sfnt_off00012573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1