Malicious PDF — malware analysis report

Static analysis result for SHA-256 894ea7942ed5450d…

MALICIOUS

PDF

77.5 KB Created: 2021-09-16 05:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 98bc8398db04d8d14a047aee1fddec7b SHA-1: 90d052679d795c77ab3d16346aeb036a4a1d44b3 SHA-256: 894ea7942ed5450dbc00723248ce777ea23b827804f1ffc2f1bbedffde00b96c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack vector appears to be the extensive use of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://inwebjor.ru/uplcv?utm_term=snack+coins+hack+apk PDF link annotation
    • http://xn--80aa5alfu.kz/file/12530145375.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/felivolisalaz.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/pedivegezumesebefaka.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/pisurovurujam.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20219141423143606.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/161327345022ba---18587898218.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/34956055782.pdfIn PDF document text
    • http://fxlcd.com/upload/file/21522126247.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/zofirorisirafetebugux.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/miboboveriragizixikufojew.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/60516025125.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/linudadu.pdfIn PDF document text
    • http://ned.ru/uploads/files/56389107779.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/kemajowagefefog.pdfIn PDF document text
    • http://raczcsalad.hu/files/73799587563.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613db6cca39f8---88295291043.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/6929998300.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/9f6d5571da93f896508c5ba2b64f564c/46066396120.pdfIn PDF document text
    • http://gr-chem.com/upload/files/80122875050.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/nerujumijesafidinovoxesi.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/38575452690.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/kutufomofigixipupesiwi.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/44098916355.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/21837736299.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfc95d5b85---bogamubusaluzujawawumus.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_off0000cdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAA 10264 bytes
SHA-256: d0697110a27349b7f4b0d809514fc68fe3e0d8a21f1d199402feae0c076fb573
font_01_sfnt_off0000e4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A3 17016 bytes
SHA-256: 2f0a25bca53d0ecc5aa24f9877de8d4713fd900f4c4f94441e44cb75f7ca018b
font_02_sfnt_off000110ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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