Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2ea5b2af6d72af…

MALICIOUS

PDF

87.0 KB Created: 2021-08-12 03:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8f98bd669623424258d61fa8f9982bd6 SHA-1: 9f6efd0a6b51efff2b58d54dbf1f332a42a06a7d SHA-256: 6b2ea5b2af6d72af46e41cf3d35760fbdc5640276d731fefdb7dc232f682dc8e
176 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it contains a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The presence of an IP address literal in a URI further supports this, as it bypasses domain reputation checks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b644982094---retufifade.pdf In PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/cc8m5vdcn75ms2n25p2ls3uqil/81487858528.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/wupiti.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/c28fk1q8abmfa2ag109bkdlji0/zidegarigukajawiwufupa.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cccabd0593---28340476860.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/bgpet4f7ipr5h5id19pmjia7fs/vusawafotinuwon.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/gpm7m3n1upegop7rgp8bdh3pk6/97170872601.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e840b6c4fb3---83450915109.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/43537670697.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099256974ec1---ronadixejumuma.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/fomagufuguzin.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/71324305452.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/39b4f39eeb01fff7a8262f994fa0552e/83838988799.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/mojejaxesekesukurawaje.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/9051198654.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/forezizi.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/64264528431.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/mateforaxomifakelewijad.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/wefaguleroxali.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e20b127fbe---41893690804.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a929907b924---garalajewafulo.pdfPDF link annotation
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4483b9d61a---58772985026.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/b7f55f32dec28359a3ef6dba0f77c26d.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=what+are+adversaries+in+wizards+unitePDF 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_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 16972 bytes
SHA-256: c615ae3a74f501c990b6408ac5c763e0031fea874024baeeddf92feed8109699
font_01_sfnt_off00011e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13678 10484 bytes
SHA-256: e8d2513992b3349e917567b15bc8d4607a69462c76ac70baab10075619e1d195

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