Malicious PDF — malware analysis report

Static analysis result for SHA-256 1948641ec98e205d…

MALICIOUS

PDF

76.5 KB Created: 2021-09-07 06:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a5448d9db240a11661dcc62cbda0a453 SHA-1: 850aeca21d0439e7e3152c7e0c07a59a339c30af SHA-256: 1948641ec98e205dabd1f71cc3333e631e2c2fa17394f23bbb687964f1f5dd3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://gioiacompany.net/images/upload/file/13196294338.pdf In PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/2fr7507gsj9i7l2s25b4df1iuf/39049093209.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd5722316e---15754492655.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/nakabunemolelurunuxoboro.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/xosakevijuzedizibiruseku.pdfIn PDF document text
    • http://belhavenhighschoolalumni.com/clients/13962/File/kevojamitipobetulu.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/zuvubekoxujawujiwopow.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/68844204535.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cddd10b2ed---sulewejijerodi.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/58850100807.pdfIn PDF document text
    • http://fxlcd.com/upload/file/kusejibuwikalog.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/tupunizanakarapixev.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/bawolofozew.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/87271783277.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/k60k3k46gt4jidke0nlnih4gd4/42201112513.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/pofuzijekuzobuzisinivuv.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/dawuzef.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/pavaxa.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-8-16/20210816120358295919.pdfIn PDF document text
    • https://rivnerun.club/images/files/terevisazufulexevusi.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/kigit.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/6483443378.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/jedin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=prevalence+of+diabetes+in+nigeria+pdfPDF link annotation
    • 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_off0000c888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC888 16368 bytes
SHA-256: b3005c8d049e283606b7e6210eb4e9066bb16a99009d51f093abbbd684e804cd
font_01_sfnt_off0000f2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF3 11000 bytes
SHA-256: 630c0b00a0dce4927b0a68237bc59f3b0de5a8e703344eb739ee62e9cd379ff4