Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd31531d3fa5e0c…

MALICIOUS

PDF

78.9 KB Created: 2021-08-19 19:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 33b586e9218e23ebc3174eeb81ca2932 SHA-1: cb4524c960f7c408203fbe601098a6cd8e374da2 SHA-256: 4dd31531d3fa5e0c8b0142495c5392705b5d3cd91fae5f53144ef9d43b0c2c8b
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 functions as a link farm, directing users to numerous compromised WordPress sites and disposable hosting domains. The embedded URLs, such as 'https://irlanc.ru/uplcv?utm_term=how+to+replace+battery+in+genie+garage+door+keypad', are likely intended to lead victims to phishing pages or download further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://irlanc.ru/uplcv?utm_term=how+to+replace+battery+in+genie+garage+door+keypad PDF link annotation
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/1dqhomuaisv9v7095k22oqhf6j/bekexavedaxavenomupaduti.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/d89c45a374819c749f36fa6936e14522/nuxozigamajomobiv.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/93355570487.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee711bd4b2---8792397828.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/mejosarakig.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/eri5o2sq1nhi9tp6ijv47mdesd/gedumamu.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/c266f243a9d94d62b52689345eb014b5/vizeto.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/15386246231.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/dilawutumigakifoxediw.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/37954831844.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/48616211373d97cf77d7558609e37c22/76847712115.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/wejorulum.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22a772f988---kodedezanafuzidetoxole.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/dobovigimesuvolegexolikid.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/kugexabakisukeza.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e868a14fb9f---gadapevisamur.pdfIn PDF document text
    • http://yfatc.com/userfiles/file/85138165024.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/96007879895.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fddb59b4fe7---72689578087.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///20216241750483436.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/21278541656.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/85889799906.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/82489470245.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/pezimozebofoxalune.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/vanebukupemojado.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB1 16180 bytes
SHA-256: fc2c2841624d1ec407267876e3280ba248afe1599be0e604d6d37e2cdc73cdec
font_01_sfnt_off0000f9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B7 10944 bytes
SHA-256: cc4a86eeae19d5143f8d0e4b0886ad63f22bd336f38ef892d64b6a30dc95682c
font_02_sfnt_off000112c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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