Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb17a0bff0fada6…

MALICIOUS

PDF

75.5 KB Created: 2021-09-05 04:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f89270213197ab3dd8aa685aca8889b8 SHA-1: 77e2e9feee4f8118f0a4dd93fd9131b7d9b304bc SHA-256: 6fb17a0bff0fada6a52147587ecead704d1ed46a68355c56bb8afa15f22aff7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous embedded URLs, many of which point to domains identified as disposable or potentially compromised CMS uploads. Heuristics indicate this is a link farm designed to redirect users, and ClamAV detection confirms its malicious nature, likely as a phishing or malware distribution vector. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://bkmjg.com/images/upload/File/dapur.pdf In PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/75397269753.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/jevamodorotud.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/11037789166.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c955a72a63b---sekesonibugagagunubumeru.pdfIn PDF document text
    • http://simonide.org/userfiles/file/vamevibediguj.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/br82poiembgokktgkdohem4hs4/18435577320.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0036b8eafb---nozugiramuresabatede.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/43857275632.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/pegalojogixozexebus.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833feda4f4b---56758918790.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • http://orhs89reunion.com/clients/77823/File/55889787590.pdfIn PDF document text
    • https://jagamimpi.net/contents//files/31642556026.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6e2e041a0---mizaberirifafiza.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb27b06cb1---25799423761.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/95670361661.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/pirefananuzuvukipirewiti.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/32652635157.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/tunaw.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021073003127_1025687690.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3293abd23---16722648776.pdfIn PDF document text
    • http://a-pluset.com/userfiles/xivup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=food+defense+pdfPDF 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_off0000c687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC687 9972 bytes
SHA-256: 1aa9af805a518b8d6efb3acc93318c0939fbabfbcb17bc85fb7c3c8026d07841
font_01_sfnt_off0000dca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BB 17236 bytes
SHA-256: 6134c48a7238675187c7d31ee68c78c705e872f694006e61f1c09b591548f02c

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