Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f35b78149e003e0…

MALICIOUS

PDF

75.6 KB Created: 2021-09-21 04:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ae82e8dd6205711bb6ba7d3d6954a6cb SHA-1: 7bcfb2f1aa4a09ee7ab2b5ebb1a8f2b4b5ea12c7 SHA-256: 7f35b78149e003e0b291204609d0129333c14be9a498146c33e8f1d3f91e3fd4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the document's structure and URL distribution are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=android+tv+box+bolivia PDF link annotation
    • https://bnovum.hu/downloads/winuzagelizonure.pdfIn PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/kiwisukazovamolibodusefob.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/44558998552.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/17529498529.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/jolez.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16140c75fad528---fuwanezezalukute.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/bibilagume.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/vutuzukimezusolujeje.pdfIn PDF document text
    • http://contextuae.com/resimler/files/vajilaxexufub.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109050756293710.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/86228969003.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/biwumamazilu.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/borekemapal.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/vedufurenagikaf.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/bagudakekikunegobu.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/3b46f044b697633eb0559f18af2a6a7d/36160836223.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/71901710568.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210915181057.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/b1fa420d9db0a035625f4bcd223f3edd/tagunulinono.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/wugabafi.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/040848511501.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/23198429873.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/jonoziso.pdfIn PDF document text
    • http://orenprom.com/img/account/file/mutenezik.pdfIn PDF document text
    • http://popeyebio.com/upload/files/sisuxifuwis.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_off0000c2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BF 10232 bytes
SHA-256: c4db3e4ab51c1678c93aa7199782bdb8eb218b64761cbe0790f5ca2f254291dc
font_01_sfnt_off0000d9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CF 17944 bytes
SHA-256: 69ab342da44d806347bdd2e7200f73293c367feed19be1b5672da4a39c9ee951
font_02_sfnt_off0001088c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1