Malicious PDF — malware analysis report

Static analysis result for SHA-256 be793b429623b5ac…

MALICIOUS

PDF

73.9 KB Created: 2021-08-13 15:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d71b731947038d6d7e6483a7deaf8c11 SHA-1: 99fb95348f7a912a825bf8490bcc4266a7dc6821 SHA-256: be793b429623b5ace4fb7c7c68f8ebf9578493a702b03fe3ed98c1fa88b7e3be
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allprintusa.com/admin/images/file/99573354533.pdf In PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/7v88i6hf2m0kjrirocf3nr7fgd/55270629689.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/88304477749.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/2042171872.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/31749759702.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/12860427148.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/6f5b2714197a485598de03c4bb5cbfb5/xaxotid.pdfIn PDF document text
    • https://nada70.org/userfiles/file/pubexu.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/tuzolapogosu.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/c5ba56159040af38b3d885cfeb2c1b5b/jozegexesawupabofutuwe.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/dubudusawiroxopunoroba.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/b1mflp0rebgb12moef6hkr7vug/sixofanebum.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/rilezepixuxomikasuv.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608eec2270f30---fazurukevefofuviwebap.pdfIn PDF document text
    • https://termocasasrl.com/file/13059909958.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/06d35244ece436099706c4f68bcd9312/70876320571.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86682e8753---47855637327.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/a67eec63bd24735ceb7d0557cfc38a45/zimijaz.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2ead44d70---xezupofurumox.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/13aaa6c25c06e43cada1bfbdca972278/vuwodakareradilufakofoj.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a4feb5e176e---26157520980.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a842442ad---79283004946.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f46ae0c6e---vetanebilirovovedafuvev.pdfIn PDF document text
    • http://andrewsexes.org/clients/867461/File/risexaganekokotu.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898030b7eac---xobisewiluzajifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+son+of+neptune+ar+test+answersPDF 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_off0000bf4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4C 10464 bytes
SHA-256: 50e600c4c32443060be3a382115686131ffae644718eac626e0acb01534f369f
font_01_sfnt_off0000d71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 16096 bytes
SHA-256: 5b76835a3bb9a7b886447139bbcb7078e7449eafa270467584dcdd3ecf7e57ad