Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f5cd42209f3a8a…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 11:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 304693727148d347a1ef659f4979cfbf SHA-1: 22f4ebde0a8f99cbcc1af963a192054580d21305 SHA-256: c4f5cd42209f3a8a0f7e7a67dd96a4ac43d2490fe2a1475414c4895d58a13281
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, 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, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • 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 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://orosweb.hu/userfiles/file/patutudedix.pdf In PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/38589619036.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/78784691313.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/33900863196.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/6489631360.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/81836515358.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/dasamaw.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/85a112b4cdff619384a20d74e0846395/nuwob.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/suvixa.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/54541335385.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210910193017198.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/finupasuxezebepelutas.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16148874d5b424---82714286703.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/16424390700.pdfIn PDF document text
    • http://rhondachem.com/d/files/bujupar.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/mejamuvefolitijepo.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/0723c1d923adf861ae92ef6330114a4a/59109890238.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/76416141814.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/keliveratezaf.pdfIn PDF document text
    • http://dkind.net/userData/board/file/53229799677.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/58381230008.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/rapupoxa.pdfIn PDF document text
    • http://anitacalderon.com/ckfinder/userfiles/files/78771440068.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/6d717rv2hfk1qbp4fbipf7aegq/58697521056.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/96450278985.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/78086949406.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/natuposev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=monster+hunter+world+android+apkPDF 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_off0000b508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1F 10760 bytes
SHA-256: 26f4fc8ba0af7823c42081ea05bf629664636080230f98f952638a0a9a90ec94
font_02_sfnt_off0000e5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DA 14876 bytes
SHA-256: 828985b238530ca5646d7e52aa340d20f7aa6197943a8f90242c842e1d20e558

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