Malicious PDF — malware analysis report

Static analysis result for SHA-256 16dc72aec357ae0d…

MALICIOUS

PDF

94.2 KB Created: 2021-06-30 11:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30d89cacdf23ad13363ee46b1397eb4f SHA-1: 411d2ff663576ac1e69c07297bf1ad8319c0aa4b SHA-256: 16dc72aec357ae0decb5c8d3d86992613b083c90120dd200d1b0b0b7e1c54b8e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farms points towards a tactic of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://ketchas.ru/uplcv?utm_term=jump+force+apk+free+download
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/48fbca8cd3dc4a8a269b1c990a317fcc/26229074623.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/9205e11ca2619ec4ba3b116e70202192/zisobuwaredeze.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a61a94ca087---madetebizigudaguk.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/cc61b585e8c89e39063c45d1f99bd82e/43292790607.pdf
    • http://pronobile.de/catalog/file/xebidokegoje.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16077b117a33dc---19526133174.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/2353a3128a8f55a643640e96b38d2f68/25730511338.pdf
    • http://www.allatpatikapecs.hu/images/file/fowapunasimex.pdf
    • http://cesishotel.com/res/wysiwyg/file/tesad.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/h631c32o286j9637ur1od9gcds/bixidofapatotoba.pdf
    • http://wych123.com/upload/files/73334239053.pdf
    • http://baigeleather.com/userfiles/file/32181858466.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/2uh7bsjjtnfrtel7lu1tdph9cd/setivole.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088b2bd62dde---mapifogekarujuj.pdf
    • https://patc.fr/imagesfile/fisivevar.pdf
    • https://ludifrance.fr/userfiles/file/tenixiranazi.pdf
    • http://sewakendragroup.com/userfiles/file/xotitogotonujuxaxuro.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97f1ba6f17---63856589388.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609833290a8d6---muxirupulafeduz.pdf
    • http://ahxxzx.com/userfiles/202105/file/13968964029.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cb51b7ebf---57857849232.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a35ac53286a---7831865867.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/af5cdfsdl7f37dobdv6qfln7jk/43513717148.pdf
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee87.bin
e710bca587abfc50749e0ff562076069c23b69a7c62e8f9d69a53062f083eca4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 10692 bytes
font_01_sfnt_off00010705.bin
28c5bcedffb0f63c0f18ed07264126f7c833899b916de9a351f9850be7cb6bae
pdf-font-stream PDF embedded font (sfnt) at offset 0x10705 1696 bytes
font_02_sfnt_off00010f11.bin
9b785fa8d6aa198ca47e7e4228cca897fdc61381b76a24e449c1a34639ea831d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F11 17664 bytes
font_03_sfnt_off00013cdb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDB 16792 bytes
font_04_sfnt_off000154ec.bin
eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8
pdf-font-stream PDF embedded font (sfnt) at offset 0x154EC 16132 bytes