Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3fcb92f0911f07…

MALICIOUS

PDF

85.0 KB Created: 2021-09-21 03:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fc38ecdff778ea40a2db574b9c443b45 SHA-1: 3cb46f87a7eb5910385171493c633db692de69bb SHA-256: 6d3fcb92f0911f07d9279855be7a9bc7020ed34fdde2a7225e048d4ef590d8ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=face+off+app+android PDF link annotation
    • https://uat-tunisia.com/userfiles/file/bezofaradefamoxolu.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/17c800e7db2302dde776b6479beee771/wokibabasaro.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/rodusogumepiruwisid.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/43722611309.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161312ee46afc3---7034072688.pdfIn PDF document text
    • http://sun-tes.ru/files/file/tisobi.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/3798451430.pdfIn PDF document text
    • http://attlas.center/userfiles/file/65797221145.pdfIn PDF document text
    • https://ceylinpin.com/calisma2/files/uploads/gasibafetotizakabeziziso.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613caf012ecf2---29296973291.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/nopap.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/puluxurulukizufomelipek.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/75512459765.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/dgq68u55kp4tp02b6l2tt9uoje/vepiliviletufofo.pdfIn PDF document text
    • http://eichler-kammerer.de/4116614828.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/1917086461.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/52203823340.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/b8f5664fa7813db6a847735cca6ceda7/90214843662.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/niwaxetadubesubojilag.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/67c8a4e674546bc22ed3157f272244d6/79684134331.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/nelevutefeku.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/jumepipa.pdfIn PDF document text
    • http://net-work.cz/data/file/godedenorejabivev.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/bopuxadobaw.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/jovurizawiminu.pdfIn PDF document text
    • 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_off0000e8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D7 18056 bytes
SHA-256: 9de1c16a5341679e6046cd3b0fd9f45b3cee24240abe92fb5f66db08d12b1e4c
font_02_sfnt_off00012fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC7 10276 bytes
SHA-256: 16dc380fb19ed414cab102e6dcabef0c44cd2442341b73a7386012805f0d8b78