Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdfaf6b387911f0f…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 00:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9bd09bb9bd7dac87f5e73fa9051dcbab SHA-1: f0c2499d19f2c4dba91ee39a5da679ae96f341ce SHA-256: cdfaf6b387911f0fc0ee065d379ce4b245f80ddbdc0e3eab0ac141e3f722d2c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to exploit users through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://rucodelniza.ru/userfiles/file/xivij.pdf In PDF document text
    • http://373113.linker.tw/files/vuzoxejaziwijol.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/xilifuluxukuvisim.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/pujagak.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/befoxizojorexopim.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/duxoxapasoka.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/0a8958ce7d4ac9926e4d44cae9a75ad6/basolurufemukolezuzog.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/68629225891.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/jenitoxudenazus.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/21724515634.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161362d3bd5193---bobikezexuxe.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/dabevaf.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/diravexogijugomuxavuf.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140bf5a62119---ratawebonunixori.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/xudegutebuziwekuwujemolir.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/67084087446.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161507aea417be---17663519250.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/wogirugilifu.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16147f2af7e5ab---zixedaxudigozapuja.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/wifiludevefigujakosudeze.pdfIn PDF document text
    • http://meta-min.com/files/zazejozexufudafapu.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/52890097570.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/73824595390.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/tasebobemewobifakujo.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/kusukejibutodirizageg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=among+us+online+game+no+downloadPDF 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_off0000b24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24D 15636 bytes
SHA-256: 4cba9f03d9ada05acd1051f271969281862ee762b64ea577cff1fa4fe648c100
font_01_sfnt_off0000da49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA49 10560 bytes
SHA-256: 7df25d4d5c8802bd77425101dcb182cabccc5f85cdff6731920ea8a6222877df
font_02_sfnt_off0000f231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.