Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc1f04173cb8ef3…

MALICIOUS

PDF

88.6 KB Created: 2021-06-29 15:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f97dca30bcacf1e86556e104ad6567b SHA-1: f562562d22b8dc5540febfc438ea7687d228a89e SHA-256: 1dc1f04173cb8ef3d91109c21207c3d0e18a2b445e3769ffffaa2ca06a8f873e
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://lawyerupsmart.com/tempimg/file/71069646747.pdf
    • http://hydrogears.com/survey/userfiles/files/62916073118.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/e98aee3e0b8196f9b8aa9816e3efdf35/19732570816.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/898hdiefs6m6us8dpgrgh2tot8/13088885801.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/stb1jtijtioa0hfd6ns65g4to2/todigidefajuduzod.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a5f609665---70541522811.pdf
    • http://clubselectionvoyages.com/images/file/59956039277.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5357210f79ed77d3b270c25ac6a16c9d/reketegabujazitegibala.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/90261c315590bc58c3a0a14283e756a1/75313132615.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/935175d71933486248c17a4ccf0a571a/97420353970.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cf3a8232f---bexogujulupa.pdf
    • http://ttccid.com/userfiles/files/berevazelorilepagaxi.pdf
    • https://alkathirilaw.com/userfiles/files/vikexabozaligovenum.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dcc60d8e7---54628708880.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d331489a2f---53680389391.pdf
    • http://vodnik48.ru/content/file/xajap.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/l9tf9jpbfhca2lgdqiskfcqhg5/mimuso.pdf
    • http://belst.by/upload/file/jitalili.pdf
    • http://hyunbulsa.org/~ewedd2/userfiles/file/94642913592.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099beaf3532b---jiviwuxolozujelitesew.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3b3625dab---pivozu.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/2ba1fe7d50c796341b1a2a31289001a3/puvuwafovew.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608793db293b2---dawopafofojotu.pdf
    • http://mmbc.cz/_data/user_files/file/6980406390.pdf
    • http://mcutech.net/files/934231100.pdf
    • http://meble-tk.pl/userfiles/file/rufapobenu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=eating+chicken+gizzards
    • 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_off0000f482.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF482 16792 bytes
font_01_sfnt_off00010c99.bin
a252687d37a44c6da4c50e52b3e0bc0e7db80f064a259c15a446c824104ce46c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C99 10620 bytes
font_02_sfnt_off000124a2.bin
81285543060231ba2b787b2cf551da57c5ad52352b0ca4bb425bc16a374fc104
pdf-font-stream PDF embedded font (sfnt) at offset 0x124A2 18376 bytes