Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f5707f4a5ab38d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 05:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 83cd2f2c7d281b552064ba035e8e8cb9 SHA-1: b8b35b81fe17f61f55025ab1b934d00c2f1572d3 SHA-256: 81f5707f4a5ab38d2610963ecfb1c1f2b9f319652d5b38823393ac94471f0053
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

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 http://thebankcardservices.com/uploads/files/dotejobekupubemewo.pdf In PDF document text
    • http://ahxxzx.com/userfiles/202105/file/negubaxobimuk.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/a90358ee9b88e1f4fe0f2df94d5b138b/webujogajematiw.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/siwesibifoxuzo.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/ruxolorutetumijovesuwo.pdfIn PDF document text
    • http://zkpower.net/upload/files/86968220175.pdfIn PDF document text
    • https://huanghecables.com/d/files/tawopotifipitodogu.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/disexegaporegezutijiwajab.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/moxuvimikifudexexerupalor.pdfIn PDF document text
    • https://bio86.net/fichiers/pomevu.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16081a31b6429a---37636173681.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/fuzuniz.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/bobeferowijazovulipimunej.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ae66f6a8645221c9ec2184c79857271d/vonodezaxaranorijamenidu.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d74645ad2c05db9eb8c099aeb96aea6f/4234824697.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/02e15b513544a17e2e1e31123cb0884f/33868638105.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/hghtdq81bnb4f6gratnuiuql94/pasegegotoja.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/7gpnm63a091dmii8jgukrr18tv/51996488892.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/4o2dmk7b1o3cnkr6lis6glqh79/68026308784.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609803edca8f4---sezudovogapifoki.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba934ceb213---bifim.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/foluninaf.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160878c86e1fe5---gosowumumamugej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e0b93c25c---56792376451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=john+holland+self+directed+search+pdfPDF 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_off0000dd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD86 17304 bytes
SHA-256: 30237f46638424a380d956d017560eee4313d6029073f9b0bdc914ce85c3a510
font_01_sfnt_off00010a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001228c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228C 10708 bytes
SHA-256: 46f54a3074751282bdaf4d33351a80001de6305042f8e2f6e7253766d1668e59

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