Malicious PDF — malware analysis report

Static analysis result for SHA-256 acaeb023ca39f770…

MALICIOUS

PDF

107.6 KB Created: 2021-09-01 00:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f245e9ce74d74532ef67e52f5f9399d8 SHA-1: 5f0fb25476027f54231079882a89b75ad4ece645 SHA-256: acaeb023ca39f770fda2497c508548ec3c375fc9a7fe005a0d6b623f4ce9630c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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://huntic.ru/uplcv?utm_term=apa+citation+of+website+with+author PDF link annotation
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607446bf02ad5---rateropuzipelotapekata.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/lepivimolelet.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ebaca3023---42674385631.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/cvmu7aod0ghug4f5o8ngiugj3m/12793823289.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba41f88cea4---dijakavixenusaxosaxisemil.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/mivudi.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/korepaxemitejokovolojawis.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/95514508177.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f596eeaf7---baxonidexawixelimofinif.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/9414899048.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161199d67a75cd---zulugukowedatawuni.pdfIn PDF document text
    • http://www.asslar.de/downloads/vaxajovog.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/42384169762.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/f71df57b2123d923efeb262a931b4ca9/naneg.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/59045783124.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ja38auv5fou819lebd20jo027v/direjo.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160eca847a6df4---51447137344.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/6e617f3904865af054160d21c6557227/fepetunewujolalotixa.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/84634953159.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/xenunepun.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5a7ac4d2e---21052904546.pdfIn PDF document text
    • https://tadimtursu.com/image/files/mumikafonuxefarepunetakip.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ejb6l7o19p16hqtn4vdggd10td/41734220058.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/loturiguvadisafag.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a47ccadb9a---65604668016.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/fananusexefabu.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_off00013e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3A 10840 bytes
SHA-256: 2c4d9f720e27541a7a4f41289cac38696bff157f7884070a8f66e4da6e359444
font_01_sfnt_off0001571f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1571F 19248 bytes
SHA-256: 0aee6ae5e891597e9a62f157a4c43e0a43c4378aefa39cd6a877d25ff449ca20
font_02_sfnt_off00018839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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