Malicious PDF — malware analysis report

Static analysis result for SHA-256 54904d71701f0fd5…

MALICIOUS

PDF

88.7 KB Created: 2021-07-06 01:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0eefee5b34de7aae6d0c91384e900299 SHA-1: d8742bf1a57395ec05fc0c27c45d65f5026837db SHA-256: 54904d71701f0fd5b454745d4d5ba1d67304a8fccb4f7cc774118d0f19e6f6af
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs point towards an attempt to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://vankouwenenmastop.nl/UserFiles/file/78230857613.pdf In PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/efca76045f9a2b3f1e85ba48ea882069/xipiveso.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072343887cad---gijenokilitakevokibuxegep.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/54327108006.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/vekokofamuvewu.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/42329194631.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cf3d05591---lejuzazapeledupuwabebofi.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/da027fc5e9dbebf1e901fc8402ace1ba/jikuvanim.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d7a90ff4c---4215361915.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608110811675a---xalovawefegidonadameraka.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/ribabazevorafutelepegip.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/zusox.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acd6dab05c4---nomutew.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cae0c4295f---20569993511.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/2f8dc613b8b6a5b793aa195945111026/masadusizulape.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/54223320967.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/87280362429.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/texunedekiwebupo.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11470ea80f---rotajajafifibifo.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/d9921660ba26d03588c8bf3a4065a140/maxizezowa.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c93e720bfbb---20653188584.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ea23f03de---wagex.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/2a2d3fc7e5e830a63d52b2fe6bca3d07/mopadinawepupotuvax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=y+is+for+yesterday+reviewPDF 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_off0000f97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001118e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118E 17152 bytes
SHA-256: 6e04f07a01abe27bae16bd98ce71247dad42d3c0f027cf493ec21182f6b89732
font_02_sfnt_off00013dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC4 10444 bytes
SHA-256: dd138cf813dfcc5c5d0572d561c9bf479c482a7b107b9c8f73891a17aa286d06

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