Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b31bd2a762e836…

MALICIOUS

PDF

92.8 KB Created: 2021-06-29 06:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 728d5ad39a5c797ad20708f9074e074a SHA-1: 0f76a1a52311bf0558e42d06286638e2dc4afd90 SHA-256: 58b31bd2a762e836b06c4a15ed9c99d19d58a0649d409cf610824a5f1dbc2bc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of external URIs and the nature of the link farm indicate an attempt to redirect users to potentially harmful content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce52652b5a---bobisudolutape.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da494377053---xekes.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/60cd37394132b5e71d46ab8afc2ba17a/61154008937.pdf
    • http://ristorantebiscione.com/userfiles/files/wojofagovunakegozatof.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b33030645---wafegozurezetana.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5434ab68a8---89335188933.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e9937288---17425732060.pdf
    • http://aldo-ins.com/userfiles/file/lafelifobejewix.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/eq4eth2mdlkc1nkiu316e25cbe/64705371820.pdf
    • http://dlt-nkp.com/fileupload//file/43550779702.pdf
    • http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/27126120604.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/0400c3182523ded3199fd0d2d3eba310/tetadulojepod.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/f412a454a0a9b999c756a44e91af00d2/60825670753.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606df6bb31b91---14676279094.pdf
    • http://hrudolf.com/userfiles/xomemamepapokesijepet.pdf
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/mivorenufunexuxerapix.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/udrl9f9f3eki7e5bkiuon1hjph/58923814303.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/06de5dc59c6eae0ee7c52ad62abc5cbd/fapolorawozekokasoko.pdf
    • https://masini-de-ambalat.ro/images/userfiles/74019012188.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/3188531b34109654042b4d0241ca47b7/16400317166.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b5e1ae434---sixefusum.pdf
    • http://hubbardfamilycircle.com/clients/62940/File/90671298520.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/f34922316c675db276b0f8d6bb7bd499/nukilozefifomemolufe.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49f4871fa2---tametufobotazajunili.pdf
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/firovadame.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/35fo49m0v4vovkqp27klf4pbb9/zixutigidapatapis.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c25ab6248a0---18923513702.pdf
    • http://szakkepzosiklos.hu/upload/file/59049628085.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=age+of+empires+3+warchiefs+product+key
    • 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_off00010299.bin
c9ce354284fe6cae1890b464377ea718a5ee6993654bc6555e4359185ed9b960		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10299 18312 bytes
font_01_sfnt_off000132a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132A4 16792 bytes
font_02_sfnt_off00014abb.bin
7cc107e49443bda35f8b5b8efa2865d76bbe1cf2cb0228cee7cb03f1f70ec719		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14ABB 11464 bytes

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