Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c0b87f660805e46…

MALICIOUS

PDF

110.8 KB Created: 2021-08-28 17:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: adb5c23744e85bee9bf0ad67784eec95 SHA-1: 180d76d37923409fe1cf5662f75097252e10dbd6 SHA-256: 6c0b87f660805e46261ea0a41bcced1b463a80b74fab9cfbbd89e8e035d36224
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs suggest a malicious link farm attack.

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://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0efc53c1e---28544652158.pdf In PDF document text
    • https://contabil-fiscal.ro/mm/file/lepubafisunudak.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/72426453038.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/rujowisuliwixi.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/kevaluv.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0ce5ead07---39914442211.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/d0ebd640qh8asfnhrhktr8h0bd/povukuposutaxe.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/32782079357.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/5699608841.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/791f05bdcf56dbb096b6b537e92c57b4/menuwige.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38fb549034---vikeloboxawez.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/76p5n5c32ok068rsusjqig49k9/mulemimal.pdfIn PDF document text
    • http://leguido.net/files/9353332539.pdfIn PDF document text
    • http://alkanboya.com/files/file///pumuliturijovedig.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc31977e6c---48856296739.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/68369904072.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/91327178987.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/j99p5dlt56vg5liahtd8ja7p96/fawedakajadeviju.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094399778e54---zavatesepapew.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160e929fa9c6f8---26325455496.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/55961475317.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/47177628975.pdfIn PDF document text
    • http://friulanapanini.com/images/file/47081775880.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/87739632479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=free+snow+leopard+downloadPDF 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_off00014c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C96 18824 bytes
SHA-256: 01799d1dfcf2e059152d125b6e9ddc5a3961f306b7a0e278485770c011ac8257
font_01_sfnt_off00017d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D98 10256 bytes
SHA-256: daa0ba78cc20eb4abcc9260801cf642c3b05d82983744a6103f88a8f087a9b19
font_02_sfnt_off000194cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.