Malicious PDF — malware analysis report

Static analysis result for SHA-256 80016fb7a9b96ba7…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 19:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d4b71d82e8daf54beb4d0098f9855f32 SHA-1: 9239abebb14d8530b630806707653f75dd0c03d5 SHA-256: 80016fb7a9b96ba710d934f6f4da83e1eac2004ad795398dc1898fa1480de0a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple links to potentially malicious content suggests an attempt to redirect the user to a site that exploits vulnerabilities or attempts to phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607417de84258---71106618412.pdf In PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/72937018711.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/59698137479.pdfIn PDF document text
    • http://indexone.ru/upload/file/gosikufabagotojuz.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16128bf6c3bca4---98533116771.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/kozarajazogukej.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613437dc5c141---bazukimugumibodop.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6be9d7f744---sutematimewizunimesixato.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/vimotuseke.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607034c0e0cca---nuzenefujigukituperi.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085610fd1274---rafimonuv.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/lelojusorexadugavosew.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/nasefewi.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/53486222116.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5780eafceb---96367113756.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4ab7ec68d5c9f4b702fc6a9c375e99e2/3446435080.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16092168355086---26864504162.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/pidet.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44d47ce879---belijapumopakujit.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/winogonigifogoz.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ghkkv880b7ftmgn8i7ot577lbl/22415202196.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd4205cff8---84131088766.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/xizixifujakidixowuw.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/e68idu4gep27rrl93hacjnpucj/gonukesexadanapogaxe.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/91252631232.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/9at7i2lq50ccmvbjhl25dks06j/givaxiwirumamafatime.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/0222ede1d283e9719d678fac5522fccb/86266154451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=compress+pdf+document+onlinePDF 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_off0000d423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD423 17572 bytes
SHA-256: 55f18e62fd67f84c931a55fd5733d189ae364e8f85d6499a0f0137b12bca313e
font_01_sfnt_off0001015a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015A 10748 bytes
SHA-256: c8044b40e930e07420b8e29ac3327d5613cccc8b6c74badcde0b293227280e79
font_02_sfnt_off00011a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1