Malicious PDF — malware analysis report

Static analysis result for SHA-256 8868aa29b96ca931…

MALICIOUS

PDF

97.6 KB Created: 2021-09-01 13:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 8ff7da1e56262a0ae33e5ac40d8d1924 SHA-1: 853d16a414c109c4e670eea8e43c6e8e3ebfd509 SHA-256: 8868aa29b96ca931b698bb603fa6874c644ef76fc5bb2a193413dbcd49eb9360
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://bahattinburyan.com/userfiles/file/vufalajijadij.pdf In PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/6858d1fd7f390222a7a79cf62e1aa557/73954400051.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/kanugosovemalazetakadukev.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210828170319.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/gejugesekufo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16098f3350bcd9---98390790208.pdfIn PDF document text
    • http://live-net.it/file/feleka.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/24236469014.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ded15d6791---77980042176.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/woxejosadakoji.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/0nrec8irip9jp262kodsvn6k94/pifalesanedodeti.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/dmcd1ur9lhntdnl05ra003bkal/borulokupeverina.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/55590687247.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/segas.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/20077011821.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/82748266160.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021052304102388.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16106979b4f270---fatozofubabimujixojuneteb.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/34050415011.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/joxavomapafuwurivetasama.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/c029dbd9d5d1bed72bf69c05244b3afd/84144988807.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1487c1fced97e1dd17fe966997692af6/96164557316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=volume+of+a+rectangular+trianglePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off0001433f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1433F 18008 bytes
SHA-256: 4b779bcee8d0437a9816958acea01f80a2172572fde5deb7c4f81eaff4bc324f
font_00_sfnt_off0000fb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 10580 bytes
SHA-256: db5430fc1bc2bff8b61f56b150bdff27c55cffd4cba1e6d34d54129f58be5b52
font_01_sfnt_off00011348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11348 18496 bytes
SHA-256: 8d97b84de189b8e82d40084fdd35ab0bf92f35fb087eb907ce66a8ab2aefa67b
font_03_sfnt_off00015f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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