Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ae62c9d0670812f…

MALICIOUS

PDF

78.7 KB Created: 2021-08-17 20:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 847498fbeb85e890fd24b4e4c7111011 SHA-1: 8eed91fb5f6c9ee45785041733e8b9f5dea30fec SHA-256: 2ae62c9d0670812fde84ff765547c277de0302e6cbb9ab7d5de38e7724cb311e
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://strandedtattoo.net/file/2964799941.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/04e4ca2277106f03f00cd0cec13a71a0/revaxomojiwegu.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088adcdd0fff---29411917254.pdf
    • http://musorcentrum.hu/files/article/file/rovereno.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/65579fd7166cd9f20c03c0de6cde0c64/rinuwela.pdf
    • http://teplolux72.ru/upload/file/13346432708.pdf
    • http://geteffective.biz/uploadfiles/file/15153435572.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/53a95410c5b08f0a89fb509ea99ea509/55189868413.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/f4c95dcdefbcb8c73ab1af8d86c71eb0/58628420551.pdf
    • https://rt-totaalafbouw.nl/userfiles/file/18435244382.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f28642fe8---88742163285.pdf
    • http://guss-ex.de/uploads/fck/file/sebokeb.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c066f11d50f---1308597871.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610d5f717f67b---42225535019.pdf
    • http://katyababash.com/images/uploads/file/paxizuvapuwakimitexoxaw.pdf
    • http://mini-garden.ru/userfiles/file/44300800112.pdf
    • http://chroscina.com/userfiles/file/nukig.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b7d0689e1---69750798444.pdf
    • https://berbagiangka.com/contents//files/3242429164.pdf
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/86146616707.pdf
    • http://augustaelectricalwork.com/editorData/file/lubalupedudowudorikogavas.pdf
    • http://doremimarlikinsaat.com/userfiles/file/72539386419.pdf
    • https://cortemadera.com/wysiwygfiles/file/fowimeb.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=real+book+6th+edition+b+flat+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfac.bin
1a5c3a8417eb55bb1e21ed2cf4ee768a924e410f1a6a822124f571f362229611
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAC 17416 bytes
font_01_sfnt_off0000fc67.bin
efb0aa9228d7ba99cbc05fc980d1f138d4ac2d29959eaa2e455f9e9984fd18f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC67 10772 bytes
font_02_sfnt_off000114e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114E8 16792 bytes