Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfcf0b8537b0c580…

MALICIOUS

PDF

111.1 KB Created: 2021-07-24 12:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 760412f6fccdbdc930734c40325454f8 SHA-1: 8931060cc889d1ccbc6a00feccfaa01935dcff10 SHA-256: bfcf0b8537b0c58054d7cf6d7e495c1706f53c4b750b42d8dcb4ca5057ca5b64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm pointing to numerous URLs, some of which are hosted on compromised CMS upload storage, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The presence of multiple external URIs and a link farm heuristic strongly supports a social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9470

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://eseninternational.com/uploads/files/43883218573.pdf In PDF document text
    • http://zrdb-drogbud.pl/Upload/file/zevagixiputufelugamidemu.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/mujufepibe.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a07fe6364ed---62589708049.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/21892236267.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/5fe10c2dac4efc24510992666041b6d1/zabilumop.pdfIn PDF document text
    • http://tai-group.com/upload/files/61233094425.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12b8e80693---zezesozugebugumezasogar.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/mireleko.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/javituwezoxudukabojow.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/lipegilimamarabuwikor.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/1595054812.pdfIn PDF document text
    • https://tl-systems.hu/files/files/mobosalafasibi.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/15101686931.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/37f299726b150e4b2cd5b8160fa518cc/6771064744.pdfIn PDF document text
    • https://x-software.cz/data/file/57847714634.pdfIn PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/kanasofuxesudamu.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/f9ea7ee86b1d1941f1af8cd4061a9843/59044753450.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/5656553717.pdfIn PDF document text
    • https://campermagazine.tv/public/file/71793850053.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/arlt383iee4q3eruh0o5ggu3ov/galuvafetevadojutaj.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/98332452239.pdfIn PDF document text
    • https://areicon.com/images/file/47159768339.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d7c450412---16197128915.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/e3e68a1d0e65f6077d31022a65bfba06/28416085669.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083a3e2e031c---32089206602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=asus+ai+suite+iii+cleaner+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC42 20420 bytes
SHA-256: effcaa854c10b76e49577ebe48e80c7c180fcf53d3da598c537e861294ad575e
font_01_sfnt_off000130ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148CB 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_03_sfnt_off00015e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E4B 10532 bytes
SHA-256: 7456ed13d2d7568b8e8fa6633f95b058be872a5c8a03d8bcec196e9fda088704
font_04_sfnt_off00017674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17674 18040 bytes
SHA-256: 7078a952dac00a1906d133ea0304b877775b465226f8df111370959f4c609a05

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