Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc29b14c997ff50f…

MALICIOUS

PDF

73.2 KB Created: 2021-09-02 01:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 518d5cf9b25e18da369e9b8291713c1a SHA-1: dadb1755d7dafea6cc0e8eb922912fe9b5ae4d9d SHA-256: fc29b14c997ff50fc2a278e4cd071397adf513ead5effc5edb212526a0ef8d35
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories 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. The presence of multiple external URIs and link farms points towards a tactic of distributing malicious content through seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://aloisiquadri.it/userfiles/files/fodopokipewularezulela.pdf In PDF document text
    • http://centrons.com/uploaded/file/88665568760fab6979de92.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/zurabopamizakeritigirezi.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/cavbb417teonbhln3kjivnetr6/31319891109.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/dovasobapukepe.pdfIn PDF document text
    • https://wonkingchina.com/d/files/vurusalunarelomawi.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/58948633222.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/cda8c7a85b5b96fefba13d17043dc4cd/29800585495.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/vamelotoxofotodo.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770c2fd2ae7---kozuvugiwaz.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/41302294137.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/23019275207.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610550e0ba0b1---vogagekowudizizuf.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/45665796921.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/wifetutosebapubovulokiz.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d92c4b8df3d---lakenojabelafurowor.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/7n2djhuqh207d3ljts6dgprti2/jowuvadesojekuzadetepinen.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/45232569663.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/k9kofhpohgl45kau7uai6thk9t/kudodalekijud.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/7749498860.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/woxowexaxosefirikumopowuf.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/xupesiroxilufavikuvili.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/38906335754.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612a5a928ea42---bokoraxejafefu.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/pasupimenopa.pdfIn PDF document text
    • http://turatabor.hu/media/98702591447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=strong+adjectives+for+goodPDF 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_off0000bcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF8 10876 bytes
SHA-256: 86bcbdc8b367176c2a5d7ca37862fe049b93a2b7578ca769a601dc21cb406d8f
font_01_sfnt_off0000d607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD607 16280 bytes
SHA-256: 6e9971e5ecfb3544713868aae497f25483c3426283b7826fa5fe22cbb1e0327f
font_02_sfnt_off0000ff8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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