Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d3728d336297f5…

MALICIOUS

PDF

84.8 KB Created: 2021-09-16 11:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a0467020dc9b14a9a96bd4e8c0a953e1 SHA-1: 5f4012ce7ec5f4fd45667fc3c3c7985b80328b68 SHA-256: b8d3728d336297f537b79f495b7ce11d2497a4874e29c2d03fbce6e6bbcef94e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to potentially compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://archism.ru/uplcv?utm_term=watch+snyder+cut+online+free+123movies PDF link annotation
    • http://salman-is.com/userfiles/file/29201109498.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/75087419320.pdfIn PDF document text
    • http://alltechsro.cz/files/gunodejaleviwot.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/2883743419.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/52623814392.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/98408835157.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614009e706c9d---43132952335.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mv91s2c9gvn2g9muakhke06ma4/nawiludizijedadutos.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/27616270331.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/71434979434.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/xazuletuxemefosunomuz.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/milefekifuzewovofowutu.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/34211527710.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/90457523578.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/xubotunijotafoxinaw.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/18692006035.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/bonerexizovigeda.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/85495953619.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/maxopiwatibolupapamuf.pdfIn PDF document text
    • http://canadianrockies.info/files/file/xamosevomugol.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/jebavusagu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/0db8994091ea8208de72a72397d8f9c9/todojesit.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/98523712661.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_off0000e37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37F 11356 bytes
SHA-256: 01285eb4852897e2564d0bce1fe47be3614bedbced7079f71b631d3113266e78
font_01_sfnt_off0000fe36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE36 18348 bytes
SHA-256: 192cb3a8aa81f90f16b63e8327682afc581c51303445d72dc4a66991a50fb320
font_02_sfnt_off00012d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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