Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5ce9571ec9812c…

MALICIOUS

PDF

85.2 KB Created: 2021-08-19 12:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d38284f337599f41c13f358b7f7e20c1 SHA-1: bc21bced6f955450cd033cc38b996a101bb0370c SHA-256: bc5ce9571ec9812c4da71a93430260dd6a19dcc8fd612d462b929652a404dd7d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a link farm pointing to compromised WordPress uploads and disposable hosting, with a high ML score and ClamAV detection as Pdf.Phishing.Trojan. The embedded URLs are likely used to redirect users to phishing sites or download further malicious content. No scripts were extracted, but the PDF structure and URL patterns strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/o8h58n465tte1klsmu8lqv48n0/10199999209.pdf In PDF document text
    • http://fernandopelosini.it/userfiles/files/bodaxesagigog.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/30408028835.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608472831313a---mububumapi.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/76779130571.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070ae2ecb7ca---jazipolebiwegeluzajuli.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/42316373331.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/xedifuzi.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a7043d0ba28---3764802033.pdfIn PDF document text
    • https://angkalaris.com/contents//files/18662469084.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/filadiwevab.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/89843953917.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/gaserulokagidumole.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8aaf8ad56e---xobofetakasow.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087853eacc4a---50944615619.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/75967368491.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f36639755f---62047189216.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/59747107700.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/70d6d58c63dfb46903fb1a01d262c0de/12282031085.pdfIn PDF document text
    • http://bakoca.hu/files/file/zawogoneridawetagenowuxeg.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/tesukujonoliwa.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/rafijokazomini.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/7e707d0f5eb81a671d6f00c8448f9c55/jifodopepalurexeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=diferencie+a+parede+celular+de+bact%C3%A9rias+gram-positivas+e+gram-negativasPDF 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_off0000e226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3D 11456 bytes
SHA-256: a6a0482fb9780df24aa06b8487453041e8b8bb1a51107dd3a4efec5ea1db8162
font_02_sfnt_off000114a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A0 19044 bytes
SHA-256: 1d28b60ecfde533f695a58781dc81281fa8a7760779dc0f53036638c22e24f45

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