Malicious PDF — malware analysis report

Static analysis result for SHA-256 99628dcee67b6ee1…

MALICIOUS

PDF

78.8 KB Created: 2021-09-16 14:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2cefa8bb685c44a1bf9c5b484bf99d52 SHA-1: a7b396587d965985998a5e42a4e525f78169ec04 SHA-256: 99628dcee67b6ee180338d50f28ff28c0a32fea10b056f28fe8cc36aa96bc8f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute malware or phish for credentials. While no executable scripts were found, the structure and embedded URLs strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613e67d5cfbc3---77354657593.pdf In PDF document text
    • http://stonestudio.pl/files/upload/file/nibakase.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/4410549932.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613417dc7b0a6---datemupurudanizuvimip.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614065d6c4414---48612264189.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/kalaseraxo.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/3536477746.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/giduzatoxe.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/xekumatunoxulitutumixabi.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/24147110456.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/pibitogedadim.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/32675451464.pdfIn PDF document text
    • http://acril.ru/ufiles/files/xejaruve.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/54559791534.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/fazegujulipofajozotet.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/zifubaxowewexozotipi.pdfIn PDF document text
    • http://sartor.ru/upload/files/divokekevetefawenujokaj.pdfIn PDF document text
    • http://kechengchem.com/upload/files/zevinijaraxosid.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/28365056775.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/rogejurepe.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/sulowa.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/41745687656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ice+cream+4+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_off0000cf82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE799 10524 bytes
SHA-256: 5eeae889972ac8c2a0f699b1c08b5ec84537c21085aafabe586a3ff9a90a2bf5
font_02_sfnt_off0000ff9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9A 17696 bytes
SHA-256: f48332fe8f9b53e08e98bd2b0967a7d3bb3ca6dbaf528a0a3b5db8e2b5a57c98