Malicious PDF — malware analysis report

Static analysis result for SHA-256 4731618c51756c33…

MALICIOUS

PDF

101.9 KB Created: 2021-06-17 06:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 80712d64f0d38ec886df0c92098efc87 SHA-1: 01881a6bc9ace194f0ac9dfb166f1b3b40341f11 SHA-256: 4731618c51756c33adbab792be3b2f5d69310efcc0361868abb11e2f4fc05520
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised websites and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple distinct hosts and UTM parameters in the URLs further supports the classification as a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://inwebjor.ru/uplcv?utm_term=hamri+karo+hath+de+raksha+lyrics PDF link annotation
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb52a2d321---jaledipudusuzi.pdfIn PDF document text
    • https://ferropula.hr/files/sagavawazoz.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd71331403---60937775304.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/68327382572.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075da892a0e6---13732015364.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/64263467867.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f5e7b74da---52254101649.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/63647906336.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607589c87e2c9---zulibexokinu.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/7efdd78ea6e016947a7ca5acd1fa736f/dadojakivowekonekorope.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/tatajazavabu.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/9150d9ec5d8da432da51055185eb33eb/45512052248.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ee79829b1---dusineperejerax.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/160745f5c236b1cc4c7ebd547456ba60/zoputufimapasijogazolaw.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16080ae48e907a---ropejebolabitaj.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/63e574bfdd6688559db9ab20bbb94103/ruxan.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/cl41m065vkv8u27dhk8rku0260/73992491506.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/96044965456.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/b688be288dab032253ddd953747b1953/17474065196.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/fupododemagolujemig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C26 5308 bytes
SHA-256: 83bfba96ff68711c11bfc0c02b6024a7215570574a93150337b7f875fad39978
font_01_sfnt_off00011e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E04 3740 bytes
SHA-256: 814992be763021c11dca23fed22b8bb7a0f9688c8b5af2f3d58b36f318d7b63c
font_02_sfnt_off0001297d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297D 2328 bytes
SHA-256: 44767bda6b00968c16a5029afc21f93e914175494fe70d5df426bb9f84af37f2
font_03_sfnt_off000133a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A1 10728 bytes
SHA-256: d87ae8ce4b22afbf969a98f465bda573b46019d1732faae5b8ee4224e90fdd10
font_04_sfnt_off00015889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15889 16016 bytes
SHA-256: 289f2a7d0e39dd2091f44b9bd722ff3902ca1693c1ed45e6125c8a200ab98f33