Malicious PDF — malware analysis report

Static analysis result for SHA-256 1869fa11696ec4f5…

MALICIOUS

PDF

88.7 KB Created: 2021-06-28 08:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5788cf45d0b06a949519e1020ea3e740 SHA-1: 57bfbc88c838543f7ee99ec8974f59dbe3417905 SHA-256: 1869fa11696ec4f575d1fcf62bb62a2076782b98ddbcb6421d24cb924737c4ba
156 Risk Score

Malware Insights

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

This 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 multiple URLs pointing to potentially compromised WordPress sites. The primary purpose appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/dd5c95e4d608e108f6831b80e968df73/56163687425.pdf
    • http://zjhywt.com/images/upload/File/vesujitivulabiputabat.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160965e821c139---jatojifor.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607408ce8a717---dusavevabagavaxujodawir.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/2a84b98aea4280488a9f1157d91c8229/madevomijimugofasedujilan.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-6-13/20210613053336441820.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608033acd769f---85970988927.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6dceb20b7---33409400255.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dm89ubdqhb5hjlqoovkqevdluq/gugazesiniwoxovujus.pdf
    • http://box8websites.com/ckfinder/userfiles/files/fiwavebidel.pdf
    • http://lnshiyue.com/userfiles/file/20210530055625_1515540049.pdf
    • https://artlabjo.com/userfiles/file/xebagamomamuwanug.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/c0e7f543f02874c2332530a9a1e7d108/14992352748.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cafec0e1442---mixuzutolomowabotisaro.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b683f2f78---65723395751.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00c1c7d8a---12272578158.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99e995104---buwozuta.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/ush4dk3i2d592g2gijr136qke8/penojotiritupokonipufafux.pdf
    • http://flatadministration.com/uploades/fckeditorfile/zazux.pdf
    • https://planet-for-events.de/userfiles/file/653472306.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609dea18dad0d---duwimepowufap.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609caf68a84a3---gexasokudisesareliz.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c016cd0f5---57814348908.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=aukey+dr+01+manual
    • 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_off0000f79c.bin
90d733c511ff35b92aef2bd98b685a229ac2bf9ae920163dbc188042c2f93efe
pdf-font-stream PDF embedded font (sfnt) at offset 0xF79C 10392 bytes
font_01_sfnt_off00010f28.bin
5e606733aa55cf5b913cbf8dcb2dc8058493107895f0a295681e341c46c6c0e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F28 17696 bytes
font_02_sfnt_off00013de2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE2 16792 bytes