Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b8fa913583da01…

MALICIOUS

PDF

98.5 KB Created: 2021-07-04 02:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36ec6fac87bf56933f7328fbda59c136 SHA-1: c725f587666316c4ab21a3c14055df63529f6462 SHA-256: 90b8fa913583da0199dbbebe1bfee2467edffcd0a4879bc78380a60c6fcbfa28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. These links likely serve as a distribution point for malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2fc031014---tanuvu.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e84fceab4d---62637859880.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/b954a5efa68a63bf3d21b6d0f5fc8f58/tijexowigasoxuzopuxisinom.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160df85aa94709---15763896849.pdf
    • http://terralindahigh1981.com/clients/866868/File/47703984465.pdf
    • http://kondicionery-domodedovo.ru/upload_picture/file/17783034678.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/f35b2b8001c54832792c72537cd42dbf/62420171933.pdf
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/xupisuv.pdf
    • https://hyosungulf.com/uploads/file/87532423631.pdf
    • https://menu2uplus.com/images/file/gejaxivatetagenejopibexuf.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/43gd6voo4e9hlqqh8umu04vqar/76414133261.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/6g3j4ntugs367nkojr3nhr2510/83527857496.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c070ea33a94---18227295799.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607951c112ac6---bogolos.pdf
    • http://ondrejkocar.cz/img/file/50565488101.pdf
    • http://www.aluvascientific.com/UserFiles/file/39710477680.pdf
    • http://samtekelektrik.com/files/dukebozus.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/be1fe4d8176b63192682c28eb116da09/xiboxewefudawodanezanuzi.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076392c97f98---79635276385.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/df0d158ca6f60f777e6f586ad64d7fd6/xuwejubep.pdf
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23522526356.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=wow+warlords+of+draenor+leveling+guide
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001066f.bin
eb0e8e3e49f34066564a9b668a32b1ebf3c14d4e0a97f5973a94b756d4dd79d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1066F 17420 bytes
font_01_sfnt_off00013412.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13412 16792 bytes
font_02_sfnt_off00014c23.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C23 16312 bytes
font_03_sfnt_off0001622f.bin
72c97894d97148406c9c07da5ab7e26f9d07371f6fd896ebfa48eda7778c808a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1622F 10676 bytes