Malicious PDF — malware analysis report

Static analysis result for SHA-256 332bbfdd9d471eda…

MALICIOUS

PDF

83.5 KB Created: 2021-06-27 20:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1a31df3ea0df47305f0c86949f13a54 SHA-1: 79cc4864fae080d1dfa129f2dc3c31c3e263f88c SHA-256: 332bbfdd9d471eda374a9665c46a4fd58405950caaa9bc839a4b9a434ea0bee7
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted from this sample, but the presence of numerous suspicious URLs strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/53af1c67300e4d9a3a8002b8c855b866/guwiwewitusazof.pdf
    • https://parfumzone.ro/files/file/34471820958.pdf
    • https://anfauglir.com/images/file/48911210879.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/65a375d07aac6231e77d46649a600a72/3503028990.pdf
    • http://yaqeen-eg.com/userfiles/file/31381319989.pdf
    • https://aravlicraft.com/cmsCart//upload/file/47509004287.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/mdf4jqqlrcgv9kemo0bt8js33n/jidamora.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c27035b10---bufedo.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/cc5e7ce28a239559ecdacd3076d2a17c/97707028436.pdf
    • http://hungthanhauto.com/luutru/files/95808676557.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c05d6fbff---92599759279.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/7436aff62ace7f3b4d805ef62d01f10d/43454917082.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/5cc83c5b15226341ece5287a50f2e6d5/15588403775.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160757bfb4d12a---60189982204.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d22c37f84---dugakiletenol.pdf
    • https://seerupit.dk/assens/file/vezutebubiganesarigosana.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/sg0bc3qr5jruh1epr6t1g9383p/gawiforomolopuladeba.pdf
    • https://fnb-concepts.com/images/uploads/files/jalotizolumud.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cb8ab309b---watexunedobunuzubadiboj.pdf
    • http://pttaccounting.com/userfiles/files/42197819599.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607570701aafe---75748136107.pdf
    • http://www.tobywells.org/media/fckdir/file/34082542888.pdf
    • http://stalmost.pl/userfiles/file/wajuvamilonodukezexa.pdf
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/31964243047.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=formula+of+total+surface+area+of+a+cube
    • 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_off0000e168.bin
472960dfaa0f176827b6f809a02d251e3bec0ff93608b879b7f02dfbe0557b2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE168 10516 bytes
font_01_sfnt_off0000f971.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF971 16792 bytes
font_02_sfnt_off00011183.bin
49bae2ce1066bfdc1cb88378eaf0bd9dccdc1d0218df75c000dcf91dcad356ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x11183 17668 bytes