Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af0723dbf8cb03b…

MALICIOUS

PDF

74.0 KB Created: 2021-09-09 13:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 71637f91ed51ac297d5a93a928e1f550 SHA-1: c23be97742f0bdc578390e923b8c9307fa3defbb SHA-256: 3af0723dbf8cb03b4e65b1c5df2c77c2a4f4da98bd22f571cdd7214f316f145e
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV confirming it as Pdf.Phishing.Trojan. The file contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating an attempt to redirect users to malicious content. The presence of numerous PDF link farm URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://krajinar.cz/soubory/files/27117576997.pdf In PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/pabejadezagudemuduw.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d7bce9934e21e62881372c1c8da28431/jajikejobelit.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/01f03a632a7b1660fffdf070e5f2b77b/vegukuwidixolalenogugikex.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/tanujulipofufuseserub.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/24666084585.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/fenimub.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/23434220789.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/39c3ba5038ba7af42783d52d8fb9c4c2/jopipeje.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/60047638610.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/mivaz.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161328ff30af8b---goxetiminuwogos.pdfIn PDF document text
    • http://mc-opony.pl/files/file/pisuma.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/sabugozudol.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/kolulakonewuzujiteno.pdfIn PDF document text
    • https://razredna-nastava.net/files/81981589401.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/34711531228.pdfIn PDF document text
    • http://yuli-china.ru/d/files/ginosakotedofopene.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/gezoperobu.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/83860626328.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306e0c9cfec---55808656566.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137355a22d81---jagoga.pdfIn PDF document text
    • https://forumsevens.com/images/file/75497417162.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/wuzigazonodabogexevite.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/watirisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pes+20+apk+obbPDF 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_off0000be2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2D 17248 bytes
SHA-256: 733cb90c57be0a7337ac5449b6c3c844c8ad949bc2e37b62dd8b6fa469535cb9
font_01_sfnt_off0000eb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1F 10280 bytes
SHA-256: 781fab178c95f70c4d0809f7a3e1af69499d0ec9581aab5e64f61adaa61962f3
font_02_sfnt_off00010246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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