Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab20ab28e63abc6…

MALICIOUS

PDF

74.7 KB Created: 2021-06-28 03:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f27215a6b1f9e7086169686a52a0d076 SHA-1: f4812f774082552f71da38270940bb7585201c53 SHA-256: aab20ab28e63abc6ae5217f16fb6b6dd4de51193bc2c4456d5a4ad8cec65c697
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The presence of JavaScript suggests an attempt to execute malicious code, likely to download further payloads or redirect the user to phishing sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/111729fd4d9b69a1b4dd966cf37831d9/dupexigu.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f4bd1196d---jelakusiretiwezapotir.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/wigozewefiwesawizox.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/aa6nhj2ba5dlev32bm98jk1eft/kewatinesaxonoj.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab8969a69---1215990261.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f4237a388---vaziwi.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/com5umnp8q5pta3arsupokgll3/zuvejeduduburane.pdf
    • https://www.passion-rnd.com/upfile/files/2021/06/27/74632607818.pdf
    • https://cambodiadriverservice.com/userfiles/file/vamozigodizusuzapojapatu.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16089672956b07---33644104545.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cecf75b4f5---91522989798.pdf
    • http://landpas.pl/upload/file/69784155801.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/h3etrle3jc5ilat5hii5pmmg1e/xivibiboribupo.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a713e7278d9---jidegulo.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/61b3111ab64fe6b760b4b263bd8d1612/47827464046.pdf
    • http://bigxra.com/uploadfile/file/2021051812283973499.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87662d25ba---42820871198.pdf
    • http://aviapartner.biz/js/ckfinder/userfiles/files/95476148413.pdf
    • https://anthonygillant.com/userfiles/file/56860532156.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160709430e90fa---95437794275.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/51lui6lur371nkkkl2ptpmisgc/82680386101.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44ad39531a---19482783045.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5a1ppgbdh751sltq6rt53is65/nubexeputekuse.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=c+program+to+reverse+words+in+a+string
    • 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_off0000be24.bin
9dfaff7b801f8fdb31729e397aa42255822b0c1baf3413b213528f70aecc687e
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE24 10872 bytes
font_01_sfnt_off0000d728.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD728 16792 bytes
font_02_sfnt_off0000ef3a.bin
fc8157c39237ca1cb08d9e21f1b911795fe2efaae7831ccd7f09e67fb89483a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3A 16948 bytes