Malicious PDF — malware analysis report

Static analysis result for SHA-256 afbb474f69638a88…

MALICIOUS

PDF

70.8 KB Created: 2021-09-21 07:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5d1e27f6a493c719449663b1a68fc770 SHA-1: 060623740b4c1c927e9d94ff8953a2335afba7a4 SHA-256: afbb474f69638a88c7b6f36aba14973249b8fc7c8d6be5890a512481473a8640
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://vialivonica.eu/userfiles/files/vikumimosinatar.pdf In PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/54106416321.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dekizadekovajobapij.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/dulamigesoj.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/nufovoxenetitipox.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/sululopuvabuwen.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/61533939084.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/43880872970.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/likomebetimiw.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d0794b3f9---23927518646.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/36539861652.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/lubufaxunelamiradepezo.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/76717399044.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/jalez.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/refilabakixuginevutokam.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/dipazabutuzel.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/vaxaladatitaniwinebod.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/68512478393.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/muzowininuxezomixiko.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/sb5d82s963tbni41d4umhcm3ef/noxediwupibitowigenenod.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161470add9b85d---31105964277.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/pijamedizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=enigma+toolbox+apkPDF 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_off0000b4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C2 10512 bytes
SHA-256: f30b876b77764ed5c70bbce87ed6a422c5333cee799de5c8f94fb7d22d412391
font_01_sfnt_off0000cc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC66 16232 bytes
SHA-256: 30702326a19d65e9325f61a71b8220f4ec3774d1fc70fb18816f2b6776078302
font_02_sfnt_off0000f601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF601 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1