Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6016501d75d0220…

MALICIOUS

PDF

87.1 KB Created: 2021-07-07 18:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ccf1052505abaec61cdd8061e4e806da SHA-1: bb76f48d3b9d4b2083e20836ef2c01f6b693ccc7 SHA-256: a6016501d75d0220ef64d75c7507b068d07e72527adc08163dbd55b39e213272
196 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it uses a link farm pointing to compromised CMS uploads and potentially disposable hosting, with one URL explicitly mentioning a 'browser extension / update installation lure'. While no scripts were extracted, the nature of the lure suggests an attempt to trick the user into executing malicious code or providing credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://unique.global/wp-content/plugins/super-forms/uploads/php/files/95d1ed74e9969217d683bcdf53acb6d7/41160802640.pdf In PDF document text
    • https://ajitcoatings.com/uploads/63658653994.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/7rs1jlsvi9m0a3q30914kpju3q/61288107931.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/542cf57ef653480fd6e1dc73b6702656/vurokajudekizanarud.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/napuvadotikupuxigasubaxa.pdfIn PDF document text
    • http://keiganproductions.com/clients/863431/File/58111286659.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/99473075139.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/noranukowulegiroxitobuwa.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/6c0a2d42b9e4bd53849f33256e19ffa4/rabatuwuvodisefumuxet.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995a34c66ef---nedukutumonakedex.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097607ac598a---6283248558.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160769740f41c7---fufemadesum.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/31924715520.pdfIn PDF document text
    • http://nhaphangmy.us/upload/files/79703754588.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/48143673633.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/e73c2a8120f61c92f9c1b88ec11aad61/fonusinuxawotalosel.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/zuzipuxugafel.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844814d8eae---pafetopajowugumotazidiwi.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c83f12606---powadatilel.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/42499630840.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/1759449351.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/fv8uucsb4of8jp2n9hnlr8tm36/kufodowabazak.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/04667fvpp4ugfapq7oe8e4fo4k/gixodezasorozawajufuvul.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160759708b09be---losuwum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=house+party+cheat+codes+pcPDF 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_off0000edd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD5 18860 bytes
SHA-256: 87d0defdf088f3e15536ba176c5bbaf028b9e9174f7be3d0608a39d7c65ff8cc
font_01_sfnt_off00011eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEE 10572 bytes
SHA-256: d8e82653d3ed31efd08e34455c9db39d99f398386962383f88e8d2091c281e9f
font_02_sfnt_off00013741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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