Malicious PDF — malware analysis report

Static analysis result for SHA-256 d001fd394caa587d…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 03:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a6cb4a0cc7f4d6678b36109c64e4b7e SHA-1: e48529eaa888eae67fd710d149d7b401023185fa SHA-256: d001fd394caa587d060082ce1aaf24ab0359713af5903409a7cc62d20ab9d3cf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URIs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URI patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://derey.nl/app/webroot/files/userfiles/files/kisaw.pdf In PDF document text
    • http://misr-consult.com/userfiles/file/93825740818.pdfIn PDF document text
    • http://linker-apps.com/files/20764157344.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135219da5727---kazurimuwejudunese.pdfIn PDF document text
    • http://pvvc.cz/files/wijulomakeb.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/6addac54cf61f5d62b941a2975b66c55/judakawimoluziwotares.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/17665963877.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/51473857736.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/74819713958.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379aacbf537---77727460084.pdfIn PDF document text
    • http://charivne.info/images/file/kikapod.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161420214b35c8---kovozabigadu.pdfPDF link annotation
    • https://advik.net/userfiles/file/fogobotavax.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/28455039274.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/lejaguduxazukowir.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/41515768218.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/53645541263.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e2d6edce4---83363876243.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/sijewamilumofoz.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/5719819515.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/58041054750.pdfIn PDF document text
    • http://watch62.ru/files/files/nukefomejebumisusid.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-9/20210909204547594042.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/lumakofebowolatu.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/visabasagadomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=anonymous+web+browserPDF 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_off0000e09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09D 16344 bytes
SHA-256: 1d421a4ea61368b56e1a5c33c056eebc513d2bdd25ea3cd6064ad78cede72276
font_01_sfnt_off00010ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD6 10292 bytes
SHA-256: d16166da5c59c778b9abd5cf1901f3ca47c28e992c8eceb0c8b2e581376222cd
font_02_sfnt_off00012220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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