Malicious PDF — malware analysis report

Static analysis result for SHA-256 924ef53e26a7d332…

MALICIOUS

PDF

86.1 KB Created: 2021-07-18 22:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 836874f9916ee501ce7ac714391321b1 SHA-1: b1283d7ed514758b8e2c1d0672f3ebfd8dd69685 SHA-256: 924ef53e26a7d332c5d79dec53ab9ed54bc2bba7de8235be1a92651416033d53
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The primary function seems to be redirecting users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://chickenwild.com/upload/contents/images/images/vofim.pdf
    • http://agrobud.net/uploaded/file/60333579977.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3be7d0810e---23540092495.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b41580b438824679210869101b5988d4/70930228678.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/cd0b992e85bb4804b1adf7a6e4dddf47/26445164881.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e196cb57d97---mojogajuwewoxibuvotesaso.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070697ca8709---vowajifu.pdf
    • http://www.sudaff.com/pics/file/pexoxajalorazanu.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57d1455ef8---6137170731.pdf
    • https://nacionalequipamentos.com/ckeditor/uploads/files/32660288116.pdf
    • http://babamoleskine.com/files/file/4142453880.pdf
    • http://ptairsupply.com/userfiles/file/18508393161.pdf
    • http://bunny888.com/ckfinder/userfiles/files/61599145423.pdf
    • https://cytairtool.com/test/userfiles/file/20210628_52bd4.pdf
    • https://propertiproperty.com/Uploads/userfiles/files/65201716732.pdf
    • https://securitydm.com/slicice/file/susino.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b96c7fb6f72---tanasovafizajofukite.pdf
    • http://mazdooradda.com/userfiles/file/jikefudipuvexifuxuvatusa.pdf
    • http://diysmart.net/userfiles/file/81012065659.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/92097117376.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=baking+with+asian+pears
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaa3.bin
3f9da65ef3a539b6f2b1696a62bb9cc0dcd15ed5d6ea68745da3b6754fc33cdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA3 10596 bytes
font_01_sfnt_off000102e5.bin
f705761080498e8f80c6c0b428d378bffe929b924064173436255adcfdffde2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102E5 18124 bytes
font_02_sfnt_off00013203.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13203 16792 bytes

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