Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc175c8d43b994e…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 04:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6c06b90354b0ddc84cc41ebea5e36d34 SHA-1: 0f16e969ffd6f0a48857850420d2a28499f20ea0 SHA-256: cbc175c8d43b994ea22455e46a49da552361c4a8469d1c350aa968583c432a75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. The presence of external URIs and link farm heuristics suggests an attempt to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607be144b4af4---tuviwawipawemanezaw.pdf In PDF document text
    • https://85097781.com/upload/files/sijirenujimavaju.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/70287361967.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16089d75333f8e---21185153217.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/7882904738.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/xaxenowipap.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/3e87bc362f6f06184954bd931b8e7989/78465381526.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/11347566860.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/rosutuleluj.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/27218139217.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/jiwebesozixavovo.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/90024702798.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/74988753216.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/zibepe.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/57293225058.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/86237937342.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/9c400e219357f56810ad908aaefc6b02/refogasuwali.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/38295679772.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/terib.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/vupabosuwavudeterepina.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/66685828475.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/xugitufotigin.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/fepixibukixumotofo.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c2589dcba63f38aa61b831c59155ec34/10874990380.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/penofewakutejusuzewifas.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48549785529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=lower+blepharoplasty+before+and+afterPDF 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_off0000e00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81F 16992 bytes
SHA-256: 0555b63000972bdd2fb078030a818cf4e5f1b7568a1ad6219bbfa80f2eaedbfa
font_02_sfnt_off0001246a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246A 10800 bytes
SHA-256: 41e80d255f1dd0b18f6615cffad03686a896c5cec5bda27d10ccde0f84e60769