Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d22f42dcd294634…

MALICIOUS

PDF

76.3 KB Created: 2021-09-16 23:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5601361179e7f0d69da54369cfbc9ea2 SHA-1: c81aa53f2b53969c5f6e93064bc37c7e7fcee82e SHA-256: 2d22f42dcd294634e76215e2c1af8e453559614463ee1c28ef9e8e0ba4397640
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The presence of ML and ClamAV detections, along with heuristics like PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM, strongly suggests malicious intent. The primary goal appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://coretry.ru/uplcv?utm_term=8+ball+pool+mod+menu+2021 PDF link annotation
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/4ccik9cnq007drac3ijvtutfoi/43181887955.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/limegix.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/ralaluwixij.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/rilikikole.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/tv5kp3roacop45av5sq8ccdjv5/bobikarikiniwiwi.pdfIn PDF document text
    • http://asustainable.com/global/file/wixurekukemipe.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/zegejowadijoxuwugir.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-12/20210912053338840575.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/rorebeviwem.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109162228206422.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/kakotanofekoz.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/30873329935.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/40704328863.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210916_2C9EB463DA79C3E2.pdfIn PDF document text
    • http://metallpress.ru/files/tatilir.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/gizukunagumowotage.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/85916844647.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/54234964705.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/vuwegavevuda.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/78164627618.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/43852544079.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161439c7837964---65845338810.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/301bb2b514bc35fd4c85add9286534f5/zuravimitapelivu.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/koxatelatikoj.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-10/20210910022755713753.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_off0000c3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BA 18648 bytes
SHA-256: 2ecc3d12308ddb31c24da4c240538f120a83494f519d80c52e83cfea3be125a8
font_01_sfnt_off0000f2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D1 10740 bytes
SHA-256: 8246ebd4edf127800e406930c11a75392a7dcf57c0902a8bb60eca629e013356
font_02_sfnt_off00010b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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