Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5dbcbd68f570c3…

MALICIOUS

PDF

95.7 KB Created: 2021-09-04 15:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ca6239733ffd3435cbb0f8948b24e92c SHA-1: fedbc5ac28e19099adb6b58b52738674c356cee6 SHA-256: cf5dbcbd68f570c38831af7ea5d5c077cd4fb7b2b4d205a58f4e2a963d137afb
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://irlanc.ru/uplcv?utm_term=connotation+and+denotation+in+poetry+worksheets PDF link annotation
    • http://pressvaluation.net/userfiles/file/vezanawojunanob.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea0f0a6629---pewuwilivowajewodu.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/54710911499.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/katunowesix.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/kijir.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e945966b611---gigibigonuzazobifop.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/s15q77mm6g5b58hprprtkmjeos/niwupinaligapop.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/levisabefilebiladanerodo.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/1657234503.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/2812177276.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c51f78c8f---90047565915.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/58684204968.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/67550393724.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/92857474602.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d38b8e76209---tamoxamuzurivisepitugoto.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/puzagekutaro.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608596b2ab855---17329952397.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/wogamipesolupibojepikiv.pdfIn PDF document text
    • https://rockoncharters.net/home/rock/public_html/ckfinder/userfiles/files/zemutetimowekamodexawude.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/32683056890.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/k5t49jjliuj5h5asr59jfb32b0/54482339413.pdfIn PDF document text
    • https://andhimazhai.com/images/files/lemedevadalerafimoferejaw.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/xuzividawesaji.pdfIn PDF document text
    • 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_off000109a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B7 10764 bytes
SHA-256: 310f133b0a0f191ff690c92834d4faaf9302763ed2f08aa2c61f5f23868c654e
font_02_sfnt_off00013a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8B 20912 bytes
SHA-256: 2f29462e4ba347aa2512eae556e5b6800ca4810d0472b90f23969e698b7ffc21

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