Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd352512cc04724f…

MALICIOUS

PDF

74.4 KB Created: 2021-09-20 10:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6a7b0973c1ad52bb9c71547d76c36e37 SHA-1: 74c07fa235f5fa983308193612c5d492deeed584 SHA-256: fd352512cc04724f0dcc46deadb7929f2d565bc817be984b3393185d91002d76
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised CMS upload storage. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely for phishing or credential harvesting. The link farm structure, with multiple URLs hosted on various domains, further supports a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://novichiha.ru/pic/file/legujiji.pdf In PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/watubotuvovivigoxemuwob.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/govaxajirobojenebaxivevoz.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142ad7bf3555---83631763807.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109191904192283.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131c128ae455---43998966307.pdfIn PDF document text
    • http://byecook.com/ckupload/files/84377711207.pdfIn PDF document text
    • http://becucci.it/userfiles/files/vokuko.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/puwedanuwesewuvave.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/98222624343.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/22967727051.pdfIn PDF document text
    • http://kotolantopeni.cz/file/vomon.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/e7ba74b381ceaf6d9a31f274b97dd22c/85615280353.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210902182735.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/79049941268.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/96380261513.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/biwomexino.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/63712961913.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/41346517881.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/89466578638.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614032263df58---minapi.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/22705355211.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/32718808685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+turn+off+app+updates+on+androidPDF 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_off0000bfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCB 10624 bytes
SHA-256: 6dbc4c3cb34a5bee095a44ba6e8712885f5903caf0e9a2d3c92a60e8345422d9
font_01_sfnt_off0000d83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83D 17260 bytes
SHA-256: 8410073175e80beb1d7ce2d81d2a9f2b5838f2deddf1e44dfd0a5365bc9092a9
font_02_sfnt_off0001040d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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