Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77c82007b5f629f…

MALICIOUS

PDF

86.4 KB Created: 2021-07-16 18:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13e6ab0497ccada3fe75649bcb2c41a8 SHA-1: 0f30ffb303d6a8fda93f2e21d5add4a10d3d62cc SHA-256: a77c82007b5f629f637eee530f1b59eb9275e027b3147b83628bd93b6388c668
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress sites acting as a link farm. The presence of embedded JavaScript and a high ML classifier score indicate malicious intent. The primary goal appears to be redirecting users through a chain of links, likely leading to a phishing page or a malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://sip7.online/wp-content/plugins/super-forms/uploads/php/files/07e29c7f2d60c2908689196d9a9be168/kisejogodixijimu.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1c6ccedbe---lafurezozejijiwig.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c66d3eb4e---88018957339.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b02c1a73ce---xibuvimufebubed.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608563f28d231---guxakagorogebupan.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a24b2a8579c---24193990413.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/kqc0om2fadlt7sa957qp0ui8fk/7719325058.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/f3a975cdc93a7191d90d5f51d1f646a5/29942570375.pdf
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/xugakad.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/8ac7368b2f34fb1bd944f9cacddf52b2/88414531121.pdf
    • http://apsencollege.org/test/fckeditor/file/niruw.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/gpjild1il77jma744a22vbfp7g/karoxa.pdf
    • https://ou-ravda.com/ckfinder/userfiles/files/67174127680.pdf
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/lafebu.pdf
    • https://bulendengin.com/upload/ckfinder/files/64404809965.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084849188cb7---pexejojes.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cec3262669---zubol.pdf
    • https://daotaolaixesontay.com/uploads/file/51531293150.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d3c4eba9---70642160086.pdf
    • https://footballsod.com/images/ck-uploads/files/lelifavazenufarikolu.pdf
    • https://okazdedziecko.pl/_files/Media/file/kojesikire.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ba98e9d59d5be32e8b960785ff1da36b/maredebe.pdf
    • https://mokhalasati.com/userfiles/files/zegokinalinonobine.pdf
    • http://tamker.hu/userfiles/file/kigofomi.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adf77a5ff73---tawonuwejesewofi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=one+knuckle+hurts
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB7 16792 bytes
font_01_sfnt_off000107c9.bin
9b74834fd41ccab710f4391eb06cf535b3f3e94f8925e03cb66e125a2c66cd07
pdf-font-stream PDF embedded font (sfnt) at offset 0x107C9 17564 bytes
font_02_sfnt_off000135e0.bin
9b02bb464b9c5c48466fc67cae27705c114ee01e5dba3273d4b59e1c783a9a5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x135E0 10168 bytes