Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c73df9ced81f5c7…

MALICIOUS

PDF

79.0 KB Created: 2021-06-29 19:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 887f208ce03a3dff0bbe3411692ed3bb SHA-1: d4893faa3460b3e98a183d2547ba019b5f3455ce SHA-256: 9c73df9ced81f5c7c859cc4f68faaf58595ee48101cddd0aef790776585e475a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=seven+sided+polygon+is+called
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/7930fd05d28d002099c26a8145bba789/sabaf.pdf
    • http://cyklo-sport-servis.cz/UserFiles/File/vokapekoxukiranef.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dc2e12703---92923890623.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945f96978ec---14265048543.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/f03d02324f60d7eb6a0f6188f944b74a/81967020653.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/593369808d5ae1657553487b69850cb8/82791391545.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/eb29d7e30928afeae939955113ec75d4/60055482113.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160779fb531f9d---95520551660.pdf
    • https://gyn-koe70.de/obrazky/file/1147216845.pdf
    • https://dotcomtravelegypt.com/userfiles/files/patavirevevipojat.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/k27urbsf6d900jih3ilqs7qkvs/62648498141.pdf
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/81020465100.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/0752d389b0cfe2c90349a2b688c8a7c6/69204552645.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/396355204e956a92413694acf2731644/sogalapatelipemosubojuna.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864802c2ef0---mogexebap.pdf
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/xanifepirikutolifoka.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f99610d81---36493257026.pdf
    • https://angkaganjil.com/contents//files/83673676527.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160984050d32bf---56107991970.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cce8eaa0fc---69440865766.pdf
    • http://swaminarayangm.org/userfiles/file/lijadisatetenogokor.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/b54fb5e39479f7784beac014a1fa5b35/74402782016.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/685fdb7b6e8d7a1ba66eb37e623afa0a/sopob.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae052d83690---88924221473.pdf
    • 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_off0000d015.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD015 16792 bytes
font_01_sfnt_off0000e82c.bin
e3b454c765abe815c511129407a3ec7b5f3ece6bfec54f1327f80e7fa107d0f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE82C 10748 bytes
font_02_sfnt_off000100ca.bin
4443a1f6678ee2e65ec5bd4dd92c1f86173fce282c7a714cb92bfe83b7f17412
pdf-font-stream PDF embedded font (sfnt) at offset 0x100CA 17724 bytes