Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7ff113c684f1bd…

MALICIOUS

PDF

116.4 KB Created: 2021-07-08 09:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 03eef4f3238b54d94eafc897368b6f04 SHA-1: 96458a18eb65eda7f1a2b067e39983fc9f2d1ac3 SHA-256: 1d7ff113c684f1bdcc0d8b6778f9f259d8dd3b0ccbf811972e8992d3e96fa590
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9676

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://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/483fda67cda935115e98169dd369aa04/53384149736.pdf In PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b755a058ba8---pibipozo.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/37420270314.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075944096461---3479725091.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/64491069740.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/lvbku2sah97s4ieim5luj80rm6/57785728181.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/doxud.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210604_F51B9D72B385CC4B.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/do15r50q1samlsa3gtq0elbh91/87454428150.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/81067049871.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/e53946dcc648da616de658ed2543b7c0/36776353256.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/83619569269.pdfIn PDF document text
    • https://masihpt1.com/contents//files/buzozenoralo.pdfIn PDF document text
    • http://www.bash.cl/media/file/dejunu.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/5hdgnfqslku5ohb3hvvb5kpnqh/magetevaba.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd4abb6748---1577349593.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa0655e7ef---gudugubanelivuru.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/81255703173.pdfIn PDF document text
    • http://zjpjxt.cn/upload/uploadfile/file/bafizemuvaj.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/1346dcfcba7bf5acc6267a7266f77593/tebekup.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608620a211903---7408725259.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160907803ef887---53114988139.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/50889053513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=knowing+brothers+ep+159+eng+subPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000191b0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x191B0 22404 bytes
SHA-256: 4f1d1df0a251e954058ec3213fa2aa372c3737c8ec024841fca1b22bd8b66620
font_00_sfnt_off000123d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D7 27488 bytes
SHA-256: a39ac32c3168be8e085641b432065a5acd3e34c40b58211ffb84fa2c86911c0d
font_01_sfnt_off00016028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001783f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1783F 10992 bytes
SHA-256: de5f5d0b3c9b4e2de4879de1da3460d4f84a21c20c1dbadb11d50ceb6fd08d4c
font_04_sfnt_off0001bb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB67 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8

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