Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc2bd8db0c208f6…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 22:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 49815842ef6f14a04d6578d054ba9374 SHA-1: 4cf74f2da932938fec34fa50b752742949757bbe SHA-256: 6dc2bd8db0c208f6fe6702f5cb8580c7acf1ece366abcfc11e076615ea96e5ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The file's structure and numerous external links indicate it is likely part of a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=conflict+management+strategies+in+schools+pdf PDF link annotation
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9ubb30nsen6rn7id96048fvkr/3246480955.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80aadd5ca7---74597008582.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608709ace8cd9---godarurezosuwumesoradup.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/nidofulosi.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/78115787610.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/77099041177.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/54359693643.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/kasemibi.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/motirixabupupewepoz.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/nmit26lbsgmlg7n5cn16gsdhs6/36017097033.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/boxodipekilivovated.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202108211121332888.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782fa2c4779---68428963523.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/df06f375877124a411688b3a0978b677/nawuvemikinesulireni.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/32b81e9fb54629a01976eb6aa1475562/xawumizenalenabubesodipen.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/64559145769.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/geferepaki.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/zusukakutimekosunod.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/2b70fe285088fd3244ca5a1313fbae71/furajo.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210619024626.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873a9114b91---wumawejo.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160704093cc8bb---33444120560.pdfIn PDF document text
    • https://paradigma.bg/uf/file/dawegirugoladudimef.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/712dc768c3e9177b92ba5c059d6d2650/37669275110.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_off0000de1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1E 11096 bytes
SHA-256: b03422275952996a23021558b7548ec52aed8ef8cd5863d03f798af1cb30e54e
font_01_sfnt_off0000f79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79A 19336 bytes
SHA-256: fc7de7cbf8979524a20860617306c253d4ec5160e60645a93c427221a1e45cbc
font_02_sfnt_off000129c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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