Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22aa78046ee128f…

MALICIOUS

PDF

85.5 KB Created: 2021-09-22 09:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aea5a0bc2865f7d82fe62b863dd17b52 SHA-1: c94b166582aced6299ff2ac4dd2046ef97f3845e SHA-256: f22aa78046ee128f581010f18de1980b6aa61f4f0ad40551bd06f2b4f29b8813
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to disposable hosting and compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The primary attack pattern involves luring users through a spearphishing attachment to access these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://casauthienan.com/fckeditor/editor/filemanager/connectors/php/temp/file/60279684936.pdf In PDF document text
    • http://jikaramen.com/uploads/files/resanes.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/22709026273.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/butalibokifoxuzujaz.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/figogivepunu.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/lejepaduzapipukapimubub.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/kuwemovetijopudububixa.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/kurajasumudusorelekoj.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/gisoxevamejosepodatitolex.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/linoxotosopukawejov.pdfIn PDF document text
    • https://www.gitialiganjlko.org/ckfinder/userfiles/files/tepavevenan.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/20431251907.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/datexonazo.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/92207435718.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/94468741658.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/7749014870.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/welekotufabobowubu.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/grt6o2u97h24ctfeoefl1keqf51rpqbc/xidezeseketisoji.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/rulokiwexodagime.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/68363832401.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/98030596476.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/defumaxatevexinijikav.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16146b4bb38977---92860626859.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/liwedefavogob.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/daloliv.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210922151141.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146d2fdde189---witabagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=adw+launcher+2PDF 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_off0000e440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE440 20720 bytes
SHA-256: 1e20ada94899aec49591ea7432bb679fbc2e896641a449dd9be6392eb10e2b55
font_01_sfnt_off00011939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13150 10276 bytes
SHA-256: 2a43f1efe7170bc940d06c390c810204dc6bd230183acf9eb160331605e13360

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