Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f655f1fccf52381…

MALICIOUS

PDF

85.2 KB Created: 2021-06-28 21:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0490adc640ef6647d578eb52c03da4e SHA-1: 05958c169684d8f16151f4026c96ca3c5aeac73f SHA-256: 5f655f1fccf52381f0d71bb144bb10176cf5f0820f8b80f8f2320a4a57c70b23
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and link farm heuristics confirms the primary function of this document is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://vejwun.cz/images/mujerugiwaxufagodadujobe.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a99bd588255---guzebaboserimisuvem.pdf
    • https://istanajpdua.com/contents//files/31510740655.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/71059992033.pdf
    • http://openendrep.com/userfiles/files/batuxabatizajub.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160726ea77ace4---dazipagepimojexejuxuf.pdf
    • https://ludifrance.fr/userfiles/file/vukarup.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc59599bfe---77670934000.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e264c7094f---lokalimokesepisabu.pdf
    • https://syntellect.ru/Repository/file/49159163402.pdf
    • https://telewebmarketing.com/FCKeditor/file/pivokaronawir.pdf
    • http://rocb-ap.org/file_media/file_image/file/sifaladefavaxibizeboge.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/ef25bf9b53ec2ad4e1dbbe8785ebbea0/lotivego.pdf
    • https://imagebeaute.fr/userfiles/file/tibuzi.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d63d775864d---72154949356.pdf
    • https://ayurvedaemart.com/uploads/file/93319864007.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9cb84c7c5---rutosabomun.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c14757b46---sazixodudedizugo.pdf
    • http://hurtmar.pl/Upload/file/nidikajiborididonesenu.pdf
    • https://ludifrance.fr/userfiles/file/33386771141.pdf
    • https://bharatbiodiesel.com/userfiles/file/62173698043.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e36920adb---5610026116.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083eb7b30634---78633893150.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=minecraft+how+to+get+wool
    • 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_off0000eb35.bin
6f4c3150982e636f4edf7a65e28fb2865287964ce47ff29a773c7fb298eaf95a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB35 10528 bytes
font_01_sfnt_off00010333.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10333 16792 bytes
font_02_sfnt_off00011b45.bin
4c71fdbbb415b4d63968e728acc36133f8a12b0775a4efee0bcc8e706672438b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B45 17192 bytes