Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7dfed2a33d3fa4…

MALICIOUS

PDF

84.2 KB Created: 2021-07-20 06:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f867dd36c878e560624554d84d2a8de SHA-1: e82a0b6ca7b480065bc14cb0eae1785d9273b18e SHA-256: 9a7dfed2a33d3fa4f1b358fb73920cc60424f7426917e92bb964fe37564a3170
176 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the embedded URLs and heuristic firings point to a common pattern of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://berbun.com/user_img/file/kezifomisedude.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b92b441cbe1---52227687030.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/e263437d42299bc29cc17b4dc4292aa1/rabiwaxepedidi.pdf
    • http://ottotech.center/userfiles/file/48773835296.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfbdec4a0c---1353815977.pdf
    • http://absolutelyneon.com/userfiles/file/maxepixojix.pdf
    • http://zubrcup.by/files/files/47596452.pdf
    • https://expobar.vn/app/webroot/files/images/pages/files/57892458985.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa15eb1b65---41116289216.pdf
    • http://veraschwemmle.de/fckdata/file/68404090687.pdf
    • http://parmalab.it/userfiles/files/fojotukitokafazaleru.pdf
    • http://beveragesgs.com/userfiles/file/luxifibugezafopaz.pdf
    • https://deniz-sogutma.org/img/userfiles/file/rujigu.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1eff1cb11---98845620401.pdf
    • http://lionsmarsala.it/userfiles/files/79929518544.pdf
    • https://bistakalikotenetwork.com/userfiles/file/82721014944.pdf
    • https://mgogs.com/mgfiles/file/6092349026.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/bda6d37e76cb99ede5914263ececb430/24332413909.pdf
    • https://vvpta-irvine.org/userfiles/file/rujunabewutukonodawu.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c7792c956ef---wejaz.pdf
    • http://marathon-gexin.com/Uploadfiles/files/dibowegudasuziwov.pdf
    • https://et-auditing.com/userfiles/files/gojevaf.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091140dd74a2---31535786594.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=work+at+a+pizza+place+hack
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e748.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE748 16792 bytes
font_01_sfnt_off0000ff5f.bin
043c23858f2d753b22c63b830bffa360ae5dae5d6a8a87df55cd44dbd547d758
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5F 10344 bytes
font_02_sfnt_off000116e7.bin
e9e52fd55edafcd7a5a8ac960e0bed61f13daf5f85a6032853e9fc8238373001
pdf-font-stream PDF embedded font (sfnt) at offset 0x116E7 17088 bytes