Malicious PDF — malware analysis report

Static analysis result for SHA-256 afcff768cf51f897…

MALICIOUS

PDF

74.7 KB Created: 2021-10-08 02:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 632852b2a7ba9977a81365fc9bf0f1c1 SHA-1: b75d9866386b03228eb4f33bcf8c0923fb7fae61 SHA-256: afcff768cf51f897c919a659e3b903d0fd4606119a972d4f7a893e279f5727ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm. The presence of external URIs and a link farm suggests an attempt to lure users to external sites, likely for phishing or malware delivery. No scripts were extracted, but the overall structure and URL patterns point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://amzentransportationindustries.com/admin/imagetemp1/file/woxumerabezap.pdf In PDF document text
    • http://maymaygiaydachidang.com/upload/files/jilejog.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/nokolaxetap.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/tazikazamir.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/jimonuwurisuwaziledezidi.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/0375bea22e8fa3a520d3a108c64c6bef/82882753485.pdfIn PDF document text
    • http://bochkari24.ru/pic/file/denumasodobewenisofe.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/19441511898.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/66180118423.pdfIn PDF document text
    • https://bunianco.com/other_files/File/65253477363.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/pamosutixunitix.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614befa623920---62885724121.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/1027789982.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/jotemebekitobujakafizekin.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/dmh27hu7bog4uvt71l86po7khi/96453617484.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/zepirujekujepoxazal.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/pexiluvodixoledet.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614814986326f---68028197227.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/xudalarovifi.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/a6f6b356b3f63687b41770230a06bfba/dituputov.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210912020325951420psv0l.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/41526586304.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/kulelodumibowonetap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=maine+dil+se+kaha+female+version+mp3+song+downloadPDF 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_off0000be02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD619 11256 bytes
SHA-256: a34b37388a82d4b271f496cb283db03e9659cdc763e913b1e1776265da50bca9
font_02_sfnt_off0000f018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF018 17508 bytes
SHA-256: e18941f590a7ae4322970bba4ba5e3e18114a9b6fcbb7075c96c1f574a6f17cb