Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9031a2feb99f5cd…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 09:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9aacfe74d759eccbb7a9b84e7e5a9447 SHA-1: 1313c26fad7f9c9d840acee5c1269440bd17a8ec SHA-256: e9031a2feb99f5cd990ee423951b7e7ed0777a6b2d57b12eb17ce76ca0d475b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, 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 presence of multiple external URIs and the overall structure point towards a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://huntic.ru/uplcv?utm_term=ctet+answer+key+2018+paper+1+set+l+pdf+download PDF link annotation
    • http://tcihk.com/userfiles/16910633401.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021070203085573499.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aebd76b6cb7---13185742920.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/20328360446.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/38640572750.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/15746331555.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e8ebb7ffe---60594316782.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/lu4ekq6dofn79j5dno3b58ukv3/simefasaxarunoliwebomabit.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/o9jc8f0ulsvt6a04pdjoq6ofd3/37051453122.pdfIn PDF document text
    • https://ccskin.com/geektic/files/91863789748.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e34bdcca4db---tefovobodonaz.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee2bf86a4d---632287967.pdfIn PDF document text
    • https://masukpt1.com/contents//files/16114486821.pdfIn PDF document text
    • https://stopserv.ru/files/file/juxubojoni.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/8657525412.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/6783997786.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/47581339751.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/35176864308.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/tidepijogozewu.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/45964743962.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/66159269055.pdfIn PDF document text
    • http://119pump.net/d/files/popofuvufasujudexufifefiw.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107281328481466.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_off0000d9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 17688 bytes
SHA-256: 153ef5ca3db9772f2d613be40d651bc3a29c75f7ec2facdda73c39e0f00814fb
font_02_sfnt_off00011f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8F 11224 bytes
SHA-256: 1db048466efe4c93a3f6a434eff3d4107b93491f18ff565e54039ab5ed19680c

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