Malicious PDF — malware analysis report

Static analysis result for SHA-256 248a828ef449277d…

MALICIOUS

PDF

93.0 KB Created: 2021-08-11 04:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c6f3056d6d1ad6061d9c76c0e85411a3 SHA-1: 453a000dc0d7ebbd6228a99cd8fc02241a1c00b9 SHA-256: 248a828ef449277df8c914a2f0de46ad6691e48d4e2785ccd1641b6e86d1b4ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://inwebjor.ru/uplcv?utm_term=byung+chul+han+la+agonia+del+eros+frases PDF link annotation
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7b69ae33d---gevoradekitonasokezafe.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb6e9a4ee5---10199581010.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae56f34b28---25071178466.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36adcd4871---35633878935.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/werimamijunigugerizopuxal.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/01dac02169528c0f5bb246eb4a888d4d/sebokuwivenolokusigago.pdfIn PDF document text
    • http://ibb-online.ru/f/file/bavum.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/sefawutejigapizox.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/debofiniretani.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/79ngaf2tgt9ds9uka5j8p5fth8/fapalagida.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/f0148f3d9243ddbddb38d698ecd6dddf/9554052901.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160949e7e652bb---kolosapagilexerogopujedi.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/boretusepubi.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/tasenikojilumopakepe.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/49133003133.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1594c3daf---wosedigapaf.pdfIn PDF document text
    • https://digireg.com/upload/jirorokapufovijusi.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/2uvq9jj7kuq8f19qlc18jcptv4/manafivenoxijepikudazak.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/dalidofufabevipofiwo.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e7fd02709---puwafikasuzepobimamerewip.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7458d951b7---jipim.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc50a7bd1321302deb62656b00389cf9/lurisile.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/29127268588.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/pnu1lnb12b0443fjsver0fhf1i/vakanolizosabopemefijez.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/976c03aed2398418aef6ca6d39332c19/84538773248.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986580c18da---2846203647.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_off000104e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFF 10924 bytes
SHA-256: 050cebc18ff96e26da20eca3c9e1ecc9e7a68dd31d4f001b64e518772bcd9493
font_02_sfnt_off0001360c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360C 17760 bytes
SHA-256: e85f12de824193a7bf0463da6e8cb91fff7db7395165c73f2296b40f2f810692

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