Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd2075889ee44ed8…

MALICIOUS

PDF

78.9 KB Created: 2021-09-20 00:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3d39c093efdc5215e8ca0bf3b0ebfea4 SHA-1: 2ed25a6809685962b4256ce956edbb6b851db0ac SHA-256: fd2075889ee44ed89e646c920ebef220af1e6fbcc7837016d316f39d588c0d1c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, suggesting an attempt to distribute further malicious content or phish users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces the malicious intent of distributing links via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://thuocnam.xyz/images/files/22019329812.pdf In PDF document text
    • http://epwuae.com/userfiles/file/24729965328.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16135e79489eaf---41902118635.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/kutekujirejomi.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161434ed90373f---77792025445.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/7661527027.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/bixagukepi.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/8268968005.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613991b23d72b---dagosunilonepusa.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/24357769230.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/tidag.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/35018728884.pdfIn PDF document text
    • http://heureka-cz.eu/files/jivezipajolujudividunaki.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/53433213831.pdfIn PDF document text
    • http://freewest.at/pipulukexezipadisi.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/22003294622.pdfIn PDF document text
    • https://renault-service.com/userfiles/fumudiginugom.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/74327864829.pdfIn PDF document text
    • http://ministerium.pt/files/zadanalapu.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/pq6f2gqhdqi63d67r58scp3ar2/91088042031.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/56624538422.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/jotawijirozoxufodifif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=save+youtube+video+download+apkPDF 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_off0000ceea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEA 10792 bytes
SHA-256: f386b363c5aea6df876c7cfb7e588c42e97c38666f6118b7d802acbca7c14dba
font_01_sfnt_off0000e7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C2 17772 bytes
SHA-256: debc90c277cf8ef0498af103b7f98f6912b1feee1f944db9eea5377c061696f5
font_02_sfnt_off0001161c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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