Malicious PDF — malware analysis report

Static analysis result for SHA-256 85af7716fff1b51d…

MALICIOUS

PDF

94.9 KB Created: 2021-07-24 19:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c42d00bef529e99b252b47556c7b315b SHA-1: dfeab4f30258e27d3fb993b15042755cf1a130de SHA-256: 85af7716fff1b51d4fd6afc66d62d859e35852aba2c757533ee6f623b02b34af
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories and other unknown URLs, suggesting it is used to distribute or host malicious content. The PDF structure and link farm indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://hms31.ru/img/file/texeguxosatow.pdf In PDF document text
    • https://pacpartner.net/images_client//imagesfile/18649144179.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/sqaovdsfm1t2emddbt0544u143/tesafironora.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/5640cf167e2f65434e71eca3b7773f66/66706289981.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/49706044672.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/67118257420.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/88684151930.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/31268026513.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ce0acc2717934ef9d7d7437b019bb42d/fazexibafuzusetevutuw.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/dividowagoxolezudedi.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/rakufapem.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad212157fdd---40230310494.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb650fd76db---18294140292.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/43498428143.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b0388028---55960408421.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/18/file/20210518_113049_172.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098eb97e7aaf---roked.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/5ee0bg2d688c1m6bh3vniat7h2/faduzatilanaje.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/luhj8e78cp3lponpj2667asql1/24057170788.pdfIn PDF document text
    • http://mosjob.ru/images/file/wamiwawoxizotoga.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/22784572264.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070d8fca62c0---gadowekupifubir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+cheat+smurf+villagePDF 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_off00010d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5A 10920 bytes
SHA-256: e5bf048e6cddb1f42a24387296e59a66ea3ca17cbb631eab1851bbd64801f0e5
font_01_sfnt_off000126af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AF 17076 bytes
SHA-256: e933475016d90eb7fe20f7fc5dcafa869d7ae5a51ecf1c2a975722fbb99169f7
font_02_sfnt_off00015372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15372 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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