Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b135e2e128d608c…

MALICIOUS

PDF

93.4 KB Created: 2021-07-23 15:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6c6dc5e27d6121be6b0a2bb7e82c24fe SHA-1: 22fdfa3cd759b2ffec8eb5d3e6fc73e908677e64 SHA-256: 9b135e2e128d608c9b2153c306b467516fb6dd0d29446874951101ed77760fe9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites, suggesting a phishing or redirection attack. The presence of multiple unknown URLs hosted on these compromised sites reinforces the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160878276824a3---25295988864.pdf In PDF document text
    • http://fittbikese.hu/files/file/xunutikojavugejal.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3913c6ebc---sanen.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/5fqake92d7n2rvcftbdpunen3u/98605539779.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jn4vicbfqm0m2nitep2s5d9cf3/77955756357.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/mukiwonasijejedepixeweke.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/sovukeseranoramib.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a669f968196---ruzas.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2563ea97c759860a70c6fdb3054b3e9b/zurotufojekami.pdfIn PDF document text
    • http://akssert.com/userfiles/files/domirelalud.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743da716679---lixatawumebuvu.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/9345770044.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ce6b2297f---xutarug.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/ff56a72839e1ff4d02861bbad4731b24/zusigifew.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/455164733.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160987cf63dc06---rezinabozofaxosoxavapudu.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/venegakubiw.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/60a132c865b85b47898c6bb69b5688c6/darewo.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/19394012451.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/zodasuvolivovuj.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/31643462009.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/20d7de6db1bd49b4b7fd747de4612861/79770194706.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be7f76b79c---puwak.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea22d3e25f---85877329172.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/49ca0d96ad5c06fca431956cdb6d73e6/rimugibogop.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af24be942f6---80969149543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=we+wear+the+mask+poetry+analysis+answersPDF 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_off0001096f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096F 17136 bytes
SHA-256: 0a321c93de8c0c178b3f15d1f3ceddaaccb620899959d19d8064f1a1e8612313
font_01_sfnt_off000135c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C6 10804 bytes
SHA-256: b577ef3abd9abdd65796867f6b05337f7c62729b9db61f8fedb2781eae37a35c
font_02_sfnt_off00014e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1