Malicious PDF — malware analysis report

Static analysis result for SHA-256 356762aea6562b23…

MALICIOUS

PDF

130.5 KB Created: 2021-10-16 09:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3f1602073c25ad03f629b1064818ffea SHA-1: b674acd4d6bbe42c4d658dd8cd32db88f1caa92f SHA-256: 356762aea6562b23069083835f0107e9c8bb52cd0b6dc4e33af0352070a52760
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to further malicious content, such as phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9828

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://smidgel.ru/uplcv?utm_term=multiplier+effect+ap+human+geography PDF link annotation
    • https://butterfly-propertymanagement.com/userfiles/file/wufojavevojibage.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/8b1c6f6bf99d90dfff83af672549e5c3/8152916930.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/banenimasiponag.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/lisedeb.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/57304563010.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/21355522038.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/d86f0963a6b0144f96f4fcdcf3a4024b/jerajujojeni.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/16863209849.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef2b422466---90287241141.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/39061935113.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d33785093d---7420656505.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/nisudibavamaxotowarefo.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/linepagukasujujiveb.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/mawevikipezevunofalapefi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136052a1cd90---xifawujijigeto.pdfIn PDF document text
    • https://webmanagement.colortown.ro/images/file/23806825472.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/lexutesaripobezizivewiw.pdfIn PDF document text
    • http://secoinblock.com/upload/files/79576828804.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/52135788857.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/pokegapejegotifuma.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/75455915794.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/sobex.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/degetipidigage.pdfIn PDF document text
    • http://lactopad.com/uploads/files/vefezezuzuxovanitofemana.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137452e903ee---tiruxalam.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615289f28faa6---3069516132.pdfIn PDF document text
    • http://agilesolutions.in/uploads/60207275659.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_off000192c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192C3 21292 bytes
SHA-256: 01dfc4752334e2ac87b8bdafa4f2df3ab0968f3a3092b9fe4debeaa4737d6aa7
font_01_sfnt_off0001cab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CAB9 10964 bytes
SHA-256: abd43e8123c481d09de6619430c156b929634d58a6090e6c089cf5af4c09683c
font_02_sfnt_off0001e406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1