Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ed83d7226997ad…

MALICIOUS

PDF

84.1 KB Created: 2021-06-29 02:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b0413c8f4233d11f64d901243fa668cb SHA-1: 55db6a507afe8c5815cb3e30aa4dfdf8b1883c2e SHA-256: b2ed83d7226997adde5c491df4b38c08203d71e3591cf26f776e76f369b48ab8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document's structure and embedded URLs align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=home+electrical+contractors PDF link annotation
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160719060b503e---85535993430.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/80959016629.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/336b5be4c75871abb2edfdb2917710e2/95771086619.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/247f41e762f9bbc063e03c2e35d9ea11/63946240379.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/aa7dea8bedf0739237925e1b590b87d5/zebadoxusaluparewoga.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d00d84453---xexutisujalozevodi.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/0713feb0924fd246d5775f14f64352aa/vejitolewafikujorigo.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2c10112fb---18218190888.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/0vapffe5opgkf288r53gakka3u/71958746776.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00ca02ab7e---54137794892.pdfIn PDF document text
    • http://marblobathware.com/app/webroot/img/files/xukapo.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/rubiludososanuxulevemu.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/03afb8193d27b709c68f75c5c44dcbd5/49721607719.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/50706087420.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/a7cb2601d7108d50e7e9f2a4ec973b05/sexelapigupul.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/37291130607.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/17290622074.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/pozaguzugufobopu.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1d0f0f619---tilotirovetutarux.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/4r82u5da94spchlm6fd35fu7h1/fodutirijevorafadurejux.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609996fd6d40a---gegotuxotixizoge.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/550730e6523fed5e6e747089d9d3503d/79793311667.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/18d5b4e9c2870e7c67f82802a7aff4aa/44273176560.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/4a1dcb1b08be0c868f693b036ceb3972/nifuluzilowunag.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/61415999759.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 10384 bytes
SHA-256: 881b99d9ca9d80f8c5a15faf6b981ce157d9c4de6de8eaffca31a42b974256f6
font_01_sfnt_off00010027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 16604 bytes
SHA-256: 260073ff62bf560367b1bc634c6363cbfba88e729448119be49b6315a8040252
font_02_sfnt_off00012b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1