Malicious PDF — malware analysis report

Static analysis result for SHA-256 be462efae4511239…

MALICIOUS

PDF

90.0 KB Created: 2021-09-05 01:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a6097936c544580b2e629c9d320d692 SHA-1: 3eaa867796d200e6118b8272adc6cdc6d68c2cb6 SHA-256: be462efae4511239d74fcbe6a4032459d65548f5c1d54a48769a8aafe13899ba
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to PDF files hosted on compromised websites. The presence of multiple unknown PDF files suggests a potential phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4baade5a5---63232607940.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d6312add6---jenopogajexesefisurej.pdf
    • http://xn--h1acbpobggs.xn--p1ai/data/files/tovetowuperoremoware.pdf
    • https://cdmsig1.com/ckfinder/userfiles/files/jobosezed.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607797ee37d54---kekekigi.pdf
    • https://worldmedglobal.com/userfiles/files/65913892841.pdf
    • https://alakharia.com/public_html/userfiles/file/41003241813.pdf
    • http://getampedmag.com/ckfinder/userfiles/files/72490125010.pdf
    • http://sztarmedia.hu/_user/file/muxusenewobakotaru.pdf
    • http://matras-devison.com/upload/file/pubuwinafe.pdf
    • http://vigova.vn/Images_upload/files/risalobipev.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b16c1428071---21159217703.pdf
    • http://rauvuonsach.com/images/uploads/files/nafegi.pdf
    • http://vitanova-cattery.com/upload/file/42690486643.pdf
    • https://gestionarival.com/userfiles/file/31128175916.pdf
    • http://csc0451.com/userfiles/file/20210626050538_n1ivfp.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a99eb23c5e8---fipudagabawalutalalikusuk.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aabc42db746---66021318471.pdf
    • http://dcbestwings.com/uploads/files/96885684104.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe13d29cd26---57373357723.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607013becc489---zubunev.pdf
    • https://geniodelweb.com/file/3811490280.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=antonio+carraro+sp+4400+manual
    • 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_off0000f5da.bin
a1ef1a672729bb44d0955dc7ad26172959d6be0817ee6683933f8e5a3113ece2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DA 19560 bytes
font_01_sfnt_off00012964.bin
7e2fd16ee18e4f2ba7e0c4260fb3ec9a85784a830fb9d3b0d76d6226d627395b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12964 10684 bytes
font_02_sfnt_off000141f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x141F7 16792 bytes