Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8052a7d3d0bca9f…

MALICIOUS

PDF

70.9 KB Created: 2021-09-18 19:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 76c1a788ac3b01ec46dfe24218f50119 SHA-1: 33f75382c826b5105290631e6dd1dc35cbe3ac0e SHA-256: b8052a7d3d0bca9f00e3a0cbe4aedbe39779bbe0b26d200931be3376a3896927
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure align with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=fox+one+special+mission+mod+apk PDF link annotation
    • http://malagi.pl/user-files/fck/file/92887456945.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/19769842943.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/jodibeg.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/94092d8e892bec1e039dc0639566a730/26408042664.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b0fc663b5---xisitet.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/wewumegulojagikes.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0c8ca1853---xisulavavoxarepofale.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210914135457_i52krc.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/90060606114.pdfIn PDF document text
    • http://df-2.de/images/daten/file/latolu.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/bitewazut.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/99885608016.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/vunetejenepuxixesen.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/7656650187.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/likebowadukukef.pdfIn PDF document text
    • http://client.diffuse.info/files/46501473165.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/gozetezutemebekowutuj.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/62381963355.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392f1ddc988---66562364030.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/39597453108.pdfIn PDF document text
    • https://lapakunited.com/contents/files/24931129452.pdfIn PDF document text
    • https://pepsima.biz/files/file/xogodofojekobi.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/66811180906.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_off0000b108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB108 17588 bytes
SHA-256: 37f09b4b70a6194df5b3b55a77a979f40876c040dc02d733845741c1dbf3788b
font_01_sfnt_off0000dd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 10648 bytes
SHA-256: ce5b7b1d0df48e5bd38cc7ad3a994d92f2bbff0800b0cb72a358d4c5faaa8496