Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a7344d9ab583db…

MALICIOUS

PDF

86.8 KB Created: 2021-09-03 19:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 505c84c88d09c74451b52e670328d1cf SHA-1: fe4ba776ee141e9fd8e7a30e6b6e75dd63a8530e SHA-256: 82a7344d9ab583db7a0bad3dd8d53ee8e30b6311b8b348a840fb6646ad43f539
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing pages, attempting to lure users into downloading additional malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090371ee30bf---16433661459.pdf In PDF document text
    • https://tepihtrava.rs//files/76022136473.pdfIn PDF document text
    • https://wineart.online/userfiles/file/40160643037.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/78229672939.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/31gieqefe8q5pt5mfms1gck4k1/ruvapilipunaduwumonegif.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f6f607af4---dadesigagobibatotu.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/41392679854.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/6282760534.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be562d75fad---93573426544.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161194847a1ef7---weludigejuwiwived.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/59731675238.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819dd96c8d0---dijeluzix.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/veziro.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/mopuputavu.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/45515313844.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/1bdb01ee4d99ea78e446be7d7ba37b20/xazatikakafoxiwe.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/26973042712.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be5385b6913---68577647.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c133398b0---tiwesanilubonasodazoxom.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/51042329518.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/edtubppvimhbh1lo1hd18f8s5u/405492239.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/14926819179.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/xotagolamajokakozizavop.pdfIn PDF document text
    • http://foodchemsino.com/d/files/buremugodoniri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=kolostomi+nedir+pdfPDF 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_off0000edc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC3 10488 bytes
SHA-256: cf8dc0b3ab97ef72e8ee592c0b821b88d8234f1131e2340ea29f85dcc6175558
font_01_sfnt_off00010582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10582 19172 bytes
SHA-256: 5c6eb1079458b24490962af610374402a6a5651e80d413e7389dc3c55cd22df6
font_02_sfnt_off00013482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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