Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99ff7049e16011d…

MALICIOUS

PDF

79.8 KB Created: 2021-09-04 07:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b8a155b65edbcaa40bb758bd3b1b6e4a SHA-1: 152180ad726fcde870e65ebdc39433a3e02837ce SHA-256: b99ff7049e16011d1a2b28747e128b6b2610373e2dfbb09219caf6d650d64fbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, specifically targeting upload directories. These links likely serve as a distribution point for malicious content, as indicated by the ClamAV detection and ML classifier. The presence of these link farms suggests an attempt to host and serve further malicious documents or payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/0eaec9bb132076680cb57fc67908d9a4/migofuwom.pdf In PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/2057db3c06d8d177975c3a51216df80d/sujipavamibidatokud.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc3ca9b578a---5941520297.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607714879f59c---39108988481.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c6af01654---desopisufonode.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/jefumapibiburatavux.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/xozolufobakabotilufaxax.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///geruwipowa.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202161332383108.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/lodaguxiwoxarexu.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/xixapipawizumoranifuvamim.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/15718339516.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce74b56818f---4530278751.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43d203a797---17173718670.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/8629541534.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e68dd3656---52347732980.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/2f189aaf2c6d2ac857d01ecce2896e2d/megako.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/goii88b9ral1s19th93ncs8c64/rokopokavobafuzuti.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944eb75e9df---vajegudorivoxiruw.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/kebejezozo.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea40a04481---94805808268.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/digutuvosozim.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///89620640905.pdfIn PDF document text
    • https://foulardfotografando.it/file/gazisinidonedub.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/58072040557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=2011+cadillac+escalade+esv+platinum+owners+manualPDF 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_off0000d22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA41 11124 bytes
SHA-256: acd8db796d3aeb61dfbfa0fa949e8d337a00607f437f27659bf2d347cabe2b39
font_02_sfnt_off00010459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10459 17088 bytes
SHA-256: 696531fb442e441db8f9066613998420386771caed432a60490093a3d92af4f2