Malicious PDF — malware analysis report

Static analysis result for SHA-256 aabc24cbc95eeef8…

MALICIOUS

PDF

76.8 KB Created: 2021-06-28 01:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1d96e045181ad29208dee2b5dd94546 SHA-1: b83d76582728048a1e3238b0786fec588dd38d2a SHA-256: aabc24cbc95eeef8b160594422a9c1413278bcb15f1897b87141f6503b1ee8d3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://starlightcelebrates.org/clients/4/43/43e9139217482d7666ce300faf566241/File/zarazovafalus.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b57d81612---vumutatulisetajitalare.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0c5c3be36---bikozanutovoda.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9307c0b805---64519363388.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1607feba34ed08---2980101613.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3424e05ea2---safutamubufonoxopi.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a8196878f---sevabikepunebanifi.pdf
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/vazarodugova.pdf
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/daa59533cbce0ad28f37f4b8090e82c8/16065696824.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e62a1da77f---nalenidas.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/998eca9d63fe722b48c00b597f38ee13/soluzawisit.pdf
    • https://zivotzaokny.eu/res/file/vudagigepogadonozogo.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c73f280c39e---rafezefumuvotazoki.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160966c7de188e---26125224815.pdf
    • http://k1a.ru/images/files/file/53898856178.pdf
    • https://room12shio4.com/contents//files/webojoni.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160869d6c21693---96005043728.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082a87f859c8---juwuwegepi.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/589069a8823d73442a77dadbd37afe79/45556726540.pdf
    • http://panziofabian.hu/fck_kepek/lokebujumoweva.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/f5417073d153dd2db2d41bb1782d32ea/labakurarimuburuv.pdf
    • http://wisdomtours.net/upload/file/88479341658.pdf
    • http://asfus.net/virgsurv/userfiles/file/40178097873.pdf
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/xozajedunifaxowe.pdf
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/fd4baac36101aba5674eede2c23ff2c9/satoribibik.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740da14aaac---35207841610.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=project+post+implementation+review+template
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8a4.bin
1f5987e9d18eb6ba6ecb7015caa8db9f3c6c6546d1bef09adb214b1aff9506a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A4 16484 bytes
font_01_sfnt_off0000f2b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B7 16792 bytes
font_02_sfnt_off00010ace.bin
7256231f331fd4db03a81f4c40d7a20435af04b87de8d098d82d0a30b8f268dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACE 10820 bytes