Malicious PDF — malware analysis report

Static analysis result for SHA-256 37dc715deeae2563…

MALICIOUS

PDF

81.5 KB Created: 2021-09-10 11:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 889ac0442cb9a599cc7bed655816087f SHA-1: 3f5724ab9ea723103feb95b937b19cb9d4b8cfd1 SHA-256: 37dc715deeae25639065f3e27cd99bc5683f5fae573312afd249d8aa03984b75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting, likely for phishing or malware distribution. The PDF contains embedded URLs that point to potentially malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://smidgel.ru/uplcv?utm_term=free+football+tv+streaming+sites PDF link annotation
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/202452b40023af58d1f2c97618450052/85493078650.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f3dde7a9c---zuxowube.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/mejewemegake.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/werotulesipobod.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/digivumanubexosi.pdfIn PDF document text
    • https://plasy.com/uploads/file/30496598625.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/85456525883.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/xalumekani.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/6178086404.pdfIn PDF document text
    • http://trevorhannant.com/vesus.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/46064953478.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/87733776312.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/49123284423.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/25449324686.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/vuzum.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe9adaba48---8710410481.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/vufepumul.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/30547717012.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/55400007071.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/1109cf8a1adb07feab0f675543e8d0ec/8189549277.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/tuzebomigufiwi.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/55849173347.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/punekuforivatoj.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/feduwivibuwokadigagexazuv.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/69671533607.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_off0000da98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA98 10740 bytes
SHA-256: 46f480eb4dcd79d540adf67496aa4438d94fd348ae760e05063067c09e6d668f
font_01_sfnt_off0000f347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF347 17244 bytes
SHA-256: c6d9f10a10e926f7c14cd95ff551725007e5d74e43dcef55f415bde3369acfaf
font_02_sfnt_off00012006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1