Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4967221f846b8c…

MALICIOUS

PDF

89.8 KB Created: 2021-07-27 17:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 31b5c2027e699eed9de182f6795aa624 SHA-1: 964641a67cd8faa26b142213e2e91bd3877e3479 SHA-256: ab4967221f846b8c0f63e17f4f74af5c8950e31cf1affaf3ebb62182c532e42f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various URLs, some hosted on compromised CMS uploads and disposable domains. The primary purpose appears to be redirecting users to potentially harmful content, likely a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db2b080f54---tevumabiwuxufofozi.pdf In PDF document text
    • http://php-lounge.de/userfiles/file/82622852993.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/4m9e27lu5k7okgjijk1iduk7k4/6665155962.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/e329cadde302c73a7f2e24cbfc9f98c8/senonunuladewob.pdfIn PDF document text
    • http://amandamaitland.com/images/file/75168487546.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/sadewevoja.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12840399143.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/19545676489.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/9f461da78d60d60b479e1f0e9e40395e/givawosaramowulunaniro.pdfIn PDF document text
    • http://satbietthu.com/luutru/files/bimuxe.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/9ddd8439f455b813afb0da8cc4da59b7/fixokosagufuzed.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/f1b684bfe71bd754a9528ab540fb1849/18829092321.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/aee3c05c483df5e0cd3ffe915e417e18/65240807550.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/dljd862hvvk5hmsog0fp1dboe2/dewoxom.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/fetujipewipagoledoxe.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff8e9e3dd39---xopokiwulatisusaki.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/burajuzusazofoxefavuwuve.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/d062cjmcbaj7tur3egkh8bmus3/radugusikepu.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/b65eaa741b200b06448d98db947a5470/87591866815.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/1d153749f3f792db282ab619f91a356f/9137672413.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/tadas.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607942310b16c---weruxopegugijimini.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/seriruwenosonigivuki.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/90749123498.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18ea9558df---7896997260.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/ripididuxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=phantomjs+html+to+pdf+command+linePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE6 18276 bytes
SHA-256: 8beb3ffc99b4d4e9c6f91a2d0b2720d4e82c0591037c46247f1b32c85ddcdb1b
font_02_sfnt_off00014022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14022 10916 bytes
SHA-256: 9be3e8f9e8e88ecd448b1c3b3a64acdcc91d72907d2176e0802cc752768c0898