Malicious PDF — malware analysis report

Static analysis result for SHA-256 d057c1b3e37d2116…

MALICIOUS

PDF

87.2 KB Created: 2021-08-22 06:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5c03e8177b339f36c8b6b4fa27c7641a SHA-1: 3e49ca668e5399e28e94cdec33989c187593b38e SHA-256: d057c1b3e37d21160743a6010972a9311a4f294a6a46dc852a5f5948f3075c4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself is indicative of a malicious intent to redirect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/452e4bd6eac47c43a151e4fe1e26c8c9/pujabapekoxepujalarojid.pdf In PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/wekamopurofuxubelis.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/99660513884.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d230ae7b5---jazamonetupagawojunimum.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/xogewasusimipawunelo.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/93562258099.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/89947676817.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/11552428462.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/52903206666.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bdeb19d05f2---33750286694.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46654ba4b5---doxiratelu.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/lexotunevo.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/xodokokugis.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/77670331241.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/87160473515.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/sfsjqit2fsetdse3rlv2vvg0tu/32870059451.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/wigineb.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7612da80a---79444744446.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/29030542571.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/wijivenedusujejavates.pdfIn PDF document text
    • http://krugernilssonreunion.org/clients/c/c3/c301050bdfa85653d7453904791897ac/File/79204955324.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/94956919201.pdfIn PDF document text
    • https://stvorki.ru/files/file/remefe.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/buvemazalawizapatogexux.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fefdd9e9c---zunejugifagisugala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=youtube+vanced+apk+para+android+4.0+4PDF 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_005_off000127af.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x127AF 21412 bytes
SHA-256: 3526e4a804303c2b1955760ae7c0aeac1bcaecd394b2d4c2e1b1d2573af5f6ae
font_00_sfnt_off0000c512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC512 19712 bytes
SHA-256: 600d9d86bd0ec550755c5d241f1e1c5fe6d9a78bac7bc67ef0d8a901e490dbfe
font_01_sfnt_off0000f652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF652 10940 bytes
SHA-256: c8ca99cdc864821d46c843b453b27a5412b9419a1c97e0059627717250837cec
font_02_sfnt_off00010f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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