Malicious PDF — malware analysis report

Static analysis result for SHA-256 993225e30da28edd…

MALICIOUS

PDF

68.2 KB Created: 2021-10-03 23:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0019cd6d613ce91793726ab2716d528e SHA-1: 675ffb1a7e02fb6439088bcbd8866975ac9b6517 SHA-256: 993225e30da28edd29b51a0cc583f892d43cc9e419d285c7d8b0000489a99677
156 Risk Score

Malware Insights

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

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 upload directories or are part of a link farm hosted on disposable domains. This suggests the PDF is designed to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://medica-eg.com/userfiles/file/56609327217.pdf In PDF document text
    • http://sarkar.ie/userfiles/file/natasulabevimuje.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/77726995454.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/gagerenurawofajatajax.pdfIn PDF document text
    • http://packamate.com/userfiles/45888118709.pdfIn PDF document text
    • https://olterus.net/contents/files/45197678758.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/r6v4n5r1a84nq6mlljb6u2lt36/19814906937.pdfIn PDF document text
    • http://gurmanosypsnys.lt/userfiles/file/13007509424.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/zemivulugelabisixasiditu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16152be1048251---komikukowesusenabetege.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16158011b34272---rusor.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/mumuzumifoxunurej.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/38777447738.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/zizivudowepuzidage.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7ef1ceda6---94895438596.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/xesavevumokamapaxobuvos.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/jobesagafiwim.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/lesutuvowezik.pdfIn PDF document text
    • http://potya.com/fugojotibotesivowemi.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210914065222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=rummy+pure+sequence+rulesPDF 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_off0000ae0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC624 10468 bytes
SHA-256: 4ad6e551421bf1bc697c98fb4131a05eced70b74514ed0b0559a3cb555b6a0c6
font_02_sfnt_off0000dde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE3 14876 bytes
SHA-256: dd17d2ec7f1e6cd0f5432805a6b593f7e8c3ac7eb9fc871f587d5b434736ec84