Malicious PDF — malware analysis report

Static analysis result for SHA-256 a175cb3e40502e0e…

MALICIOUS

PDF

79.0 KB Created: 2021-09-14 12:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1081ff4bc005b731a40d39fef17bbf7e SHA-1: 96189bd679ed9f65a99dd6f9f4e3d5826b2f8f85 SHA-256: a175cb3e40502e0e9a5f5749a021edce9a6848f6f0a05b6f702ff36c6d6cf0e0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URI and link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.rsvpcatering-ar.com/files/imagesfile/12084949166.pdf In PDF document text
    • https://maintogelonline2.org/contents/files/xomalewaxiditonem.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/38853564379.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/vovupomol.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/41391581487.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/guxomiwi.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/tujuziz.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/sixapolakexapedoko.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9a4ed8611---69389645355.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/44726785789.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/69678849115.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/kifibo.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/40653218753.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/cf8477495cb13b41d8b46e180cf1699c/65966979952.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/10330207052.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/78881730286.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210909_171429.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134fab1d89f0---24768813929.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/17399148291.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/sepadexesudavakazupota.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/fejovinoleve.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/9407250844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=moba+injector+2021PDF 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_off0000d161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD161 17512 bytes
SHA-256: ea7608d8bf56607f02bc1395926bbc0cf77c75b2a68b79cc4404a0f40404cb73
font_01_sfnt_off0000fea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA6 10568 bytes
SHA-256: 075f56b5a3a3368deef3e545afa8864dc8302026b884e7b2bcc089d4048a879e
font_02_sfnt_off000116f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1