Malicious PDF — malware analysis report

Static analysis result for SHA-256 8618b7e09a642ae9…

MALICIOUS

PDF

84.0 KB Created: 2021-07-06 00:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d764250324d3ba8792012dea808ed0eb SHA-1: 9f7e1c92a4773b582f562b09bcac38c5d5ec90c7 SHA-256: 8618b7e09a642ae9c35aa0333674040f28c5f5092d67e0bea350a41441e16145
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised CMS upload directories or disposable hosting. While no scripts were extracted, the structure and URL patterns suggest the document is designed to lure users to external sites, which could host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/42345182046.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b58e03055---71281434512.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/e7d10876e94e4f018805ce775a6c772e/wobupetenabakavazatujaxem.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae260a89983---seputiterakowe.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/4be4f46adcf93ee98dc1ddd52d580694/wosule.pdf
    • https://hpsoft.shop/upload/files/8682309484.pdf
    • http://ed-web.cz/userfilesfile/pitudonudaba.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093558f79df6---lovuwuvepelonezonuziroke.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6e2693b62---gulujizeweni.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094064eaafd0---94982265544.pdf
    • http://phantasos.org/userfiles/file/40847702080.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d263bfb06508d9e30278f11e35fba337/webepusatakuvepoparuler.pdf
    • http://xn--dlek-5qa.com/admin/UserFiles/file/batex.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/of0k43n0ira0lpvoi4jffmk13s/5246341051.pdf
    • https://burlingame.com/wysiwygfiles/file/kemizonirurexumovimo.pdf
    • http://bafiti.com/sklep/userfiles/file/91863297107.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/c4bdq9q2q2527ja48c2osa4mf4/9604847374.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb9fdd9418---buzijerezevena.pdf
    • https://narimasu-chintai.net/jcfiles/file/lunefelaxel.pdf
    • https://cplastik.cz/data/cms/file/nilusidifu.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728a84c72e8---kukujovaxivizu.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19359ee892---9928125847.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/6d1eefbe5f3449350eab317194ab0e7d/67953341003.pdf
    • https://dotcomtravelegypt.com/userfiles/files/getefi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=rs+aggarwal+solutions+class+9+old+edition
    • 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_off0000e605.bin
5fcfcd822b54683f222f167d8a63f495201d6e0ef8d5630f571de24802ce9a14
pdf-font-stream PDF embedded font (sfnt) at offset 0xE605 16512 bytes
font_01_sfnt_off000110ec.bin
d71d2549c12f8178008de35b5f25b37519e044162af54f0178ac244136e640ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x110EC 10944 bytes
font_02_sfnt_off00012a56.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A56 16792 bytes