Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef788c7cf6797be…

MALICIOUS

PDF

96.9 KB Created: 2021-09-02 14:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e3bb37ac97c160c9316af5da7936452e SHA-1: b9b321a7aca9168d304f8ed0a39bd36b8906b498 SHA-256: 2ef788c7cf6797befce31d1ca7fa4cda7d9499209fb717f1486fb13bca8b37e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains numerous external links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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=dinosaur+dumbbell+training+pdf PDF link annotation
    • http://nanumed.ro/uploads/files/dutijaxumapajekub.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/82598965172.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/75393387099.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07e1c8b346---98144239381.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/3590cd71043378ef32b295f48eda9b16/fegebubezo.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/28404421955.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b01e00afc8---38546036274.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/71132801a43f609eb80630da52960fbd/divixonogekuduwum.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/bupelinisunofeloposebosar.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/96501086567.pdfIn PDF document text
    • http://fundraisingwebsites.com/clients/9/96/963d931f30a9d2280975e71a7f923c96/File/zogibikisepudura.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/luvamu.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/51405401109.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/39950376578.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612942adb2549---70237419952.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608998435ec03---wedakozonimezevasosifaja.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbab8e4ed41---52793611299.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/fosewabali.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/31750447206.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c818201db6---kewememukav.pdfIn PDF document text
    • http://dental1970.com/clients/5/52/52cfbc2c58cc98a1938bca6351e90795/File/suwupokejikifonolajagimi.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/b9dd54e17926cc9c5db8f660dca8184a/58055736270.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/b28630d9ae0f3793b7a45e6742a845ec/50504495800.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/daxuxatipegiveb.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_off00011310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11310 18952 bytes
SHA-256: 662affd05017d3938817347ae69274f6b1a6863ae47f88fb313f89ad5daf7422
font_01_sfnt_off00014484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14484 11080 bytes
SHA-256: 2c2113a8175a4e9db999616fef7e45eddb285e46a9b196e4e3db7784e77ab08b
font_02_sfnt_off00015de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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