Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a142063ff556cc…

MALICIOUS

PDF

82.3 KB Created: 2021-09-10 06:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a020ecdcfc90eb97bee8deded8a5fcb2 SHA-1: c3e956ed193a5d5fbed96dcf80846b31defb207e SHA-256: 85a142063ff556cc52ddb9ac1c879af6d15236a5953fb626b008b7dd49fb05bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation attempt. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=hack+angry+birds+2+apk PDF link annotation
    • http://ngoinvest.com/uploads/ckfinder/files/zofezekav.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/zupiwozapi.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/69670691557.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/rider.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/xibafetunapejuris.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/42496569127.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387a1c2736a---57873633227.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/kesarerofabilota.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/77092488669.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/7661161743.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/19906288653.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/76232915803.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/50319811112.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138402a7d46c---tenomibojivudosufularim.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/24289676341.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/30350949750.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/livezavosodura.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/34796694645.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613075b067452---demipudut.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/56123791942.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/ratotivazaditod.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/dabururalesep.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/28476746863.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/xatidude.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_off0000d939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF150 10752 bytes
SHA-256: 106023faae645b4330dcf7b52eea13edc844c27f8a0509f2b90377b49221f99f
font_02_sfnt_off000109be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BE 19400 bytes
SHA-256: d2a4d6a9725a1c9fcc5025d9082fe71ed88cecac42652fd8071be3bc2b582d28

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