Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c219711f9c3644…

MALICIOUS

PDF

87.6 KB Created: 2021-06-28 21:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6c720edecd922bc2d430bcf905ba15d5 SHA-1: 5dd2243fd189922b4f37b37849091d5193a5d145 SHA-256: 81c219711f9c3644f540db05227c164a4fa5d7e1583cfff1ccd2629499c44dfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations. The heuristic firings indicate that this PDF is functioning as a link farm, likely intended to redirect users to malicious sites for phishing or malware delivery. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=browser+compatibility+testing+online PDF link annotation
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ho8dd8g0b2b31972c15cka6u97/wevijosusigu.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4351e665b93dc9b756d6fb4c6de6dd42/27948405401.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/37688a3f3576996db6db1302040d9c5d/53772551304.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2c298557136d89333380ff5315ac3570/748819063.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/88402040120.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/59456010631.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/d65fef076e6ca0e6adb106a4666fbec4/vejor.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/pikusikudesumanilomebo.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/f36sk2010vkn35dr6js0iqu6aj/sagiteretabidak.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/cd39bfbb16c42edd1f520d0a8d57de58/rumajixabupixikezizexida.pdfIn PDF document text
    • http://vodnik48.ru/content/file/5053960995.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/imo7g88sclf11slp8qq5ilb9do/vexodelasedewigi.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a2860b99803370a84777dfc827f3f6e1/77692587914.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/fb018625fc804cd98dc38681cd98b9f8/jezurabososifiwewisefux.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/mutom.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/wajakinaxujokit.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074d0c521eb1---43941044290.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050900570729.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b098c6e4c0---xusawikovapulojelogifanu.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/db4f4d23892d4107362270232ad44580/53118905545.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hr9blv6frdqv6h6a1d0ea1ij96/wifupusoriwajipemiwefa.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca61e9976c---53427167642.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/gb68j4vapknmfont6v35270e8a/20688380530.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF260 17124 bytes
SHA-256: 51bc765db0b30419c4c34c5759c3c0f9cd5d4f684c644bbc8f510f7a87c2b852
font_01_sfnt_off00011f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001371d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371D 11108 bytes
SHA-256: cbb67c11ad833225dbf3c4e7d12f5c2b777e7d3c26fefd6417c8e782ab3ec9c3

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