Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a34111ac6d37e6c…

MALICIOUS

PDF

73.5 KB Created: 2021-07-21 20:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6ccb4d5899c70ca9fb173e0835a65024 SHA-1: 463a07ca46629a34b83c5b480b290ab58f2237c7 SHA-256: 8a34111ac6d37e6c3c154c4a457ed3210be19c5cc87aa9eff29519369c14b6c3
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to facilitate phishing or malware delivery. No scripts were extracted, but the overall structure and URL patterns point towards a malicious PDF designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://myshopekerala.com/userfiles/file/toranufawefozozakufi.pdf In PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091bebb7bc7a---72630784483.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607c55a0314ed---nukuripeveganafunexaditi.pdfIn PDF document text
    • https://dm288.com/slicice/file/sakidowagadatiw.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/2lh3467oh367httlgjnqa0aqu2/4821479784.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/31713928861.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c5e887dad297d01557f3159380b84c9c/xifamexodilil.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/d7eecb689f5c97bf243da3a7ab4c1acc/supolawumevuwomekover.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a242d432030---44321561610.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e959355a84---tagakiwubulalu.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/2372657662.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/vixebanalowik.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/jc2htcfcrbgq9neb72sge94gim/28400079164.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609eea494a33f---dazuwe.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c64c45ea00f---83603436313.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021043004073873499.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/zarukuripib.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/xerorokezexewexajoxitetex.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/15477812338.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/judoxurubefape.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/24450324275.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/daaa0cd6c1d1b70d5691e28da3a59b2d/mexagufetu.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/jojavarogafuvan.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/bjj4h3g60jj963bh9gbp1uo2hd/nukufapesipekerisiw.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/87229ab333364a3f76c4f207ec46cf82/zizitube.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/df0e25842b6ccdbde68e2ce584c00b21/ditawepafuxugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=wow+primal+eggPDF 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_off0000bf42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD754 16024 bytes
SHA-256: 0e0d0d1f18b47e2c30ef473a487e0429f0f5a2fef5574a4c04d574bbe143ac58
font_02_sfnt_off000100d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D0 10304 bytes
SHA-256: 1e554cd8e4449364f5f91a50abba18071748bf21afe241624659a2febf5f6dff