Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34a7d4cbf991540…

MALICIOUS

PDF

99.9 KB Created: 2021-08-24 18:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b4ed94d15a83321c082c756202e97e1a SHA-1: 6ec23cdc954e9e29e4f1e30c123dbbd526971fea SHA-256: c34a7d4cbf9915402bc2e48b02b28995d00d4b994480e258052b9dc6d5ed4807
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection as a trojan indicate a likely intent to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073753d39aa5---51082062246.pdf In PDF document text
    • http://balcimimarlik.com/resimler/files/luwonujakojaxetopure.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/25999495580.pdfIn PDF document text
    • https://pepsima.biz/files/file/77506312296.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a931a065948---4054934987.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/95234292625.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160baf31110924---kurufejexitabure.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/xumanobaxemivufife.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/31288292209.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb1f3eefac---19586866012.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/33553762392.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16076d0d287b89---kemawojixumununawalom.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/2ef3c4a2ddb641fc12911a9fcaea970a/269809898.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/rurisijasanibulevige.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/fp1rlab3mohgbhm771qk0npo6k/pigoruwabufifebitipobiv.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611db7ea27faf---42138443479.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/93850127255.pdfIn PDF document text
    • http://clingac.com/d/files/zubugejewakesoxadosedowu.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/xupigijumiweda.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/22158887641.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/6iaetnnt19uvfuvuabg4vogfq7/vefijesomitufujexelu.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/mn9b08jichvakda3l2ocoalom6/navilezuxalexoj.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/regumumokugakumebefap.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/17987739102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=the+history+of+the+devil+and+the+idea+of+evil+pdfPDF 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_off00011ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC3 20104 bytes
SHA-256: b3c885ea7d1407c0f0d8d83bea961ecf9e3c5b98b4fde00295df535609ee9df1
font_01_sfnt_off00015065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001687c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1687C 10740 bytes
SHA-256: c00f78e9eb32d922885f84b0c51da0dc8716831f086d9a4cd1256c25a31a9508

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