Malicious PDF — malware analysis report

Static analysis result for SHA-256 5522bb94d58b0c56…

MALICIOUS

PDF

186.3 KB Created: 2021-06-25 23:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: db36b6a2dc6995c091f6d761b37090af SHA-1: 3f5756826b5fe7d0d70bc995d9535f4a90ccee42 SHA-256: 5522bb94d58b0c5691298ab039175b69cc902fcbc4223305701d5ef65f3dec4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which are hosted on compromised WordPress upload directories. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

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://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b92f32db3---41984122159.pdf In PDF document text
    • http://globalquestconsulting.com/userfiles/files/niduloropekujok.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/bimexuzuwij.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f1473115e---80663074572.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/xuxabederetimefivitagez.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/09d7370b280cbecbe27c258521b49916/vageguteloxigoritixidim.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/77573638992.pdfIn PDF document text
    • http://canoeing.by/pics/files/26226474615.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/98847339873.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/149c6f4cf8f7a1e1fa4affb13cbdf96a/gejanemugufi.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c2186d449---2711617678.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a49593b0ded---gigosutobemirosanuz.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/c189309bb43a1efa0354cd6f0a0f05f9/fakima.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/52767169311.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/90a234279348787936af22aec0c59940/91973470364.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160970cbe6e372---94598409492.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210522082315.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2b9f37e9b---34978554987.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/5110e749f2caeadae434cd0a30c73150/sitizosazuviwurewefuna.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ht5s41urm9fj2773bv9h8m3fo/12130422093.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/pazesinewazojopo.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/93352764047.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/4afa5d17c83c9aeb0cb5f5cccf6f592a/zapunizupotozusazanokozik.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/kgevhnp3deipn19diq7qrtsc2p/12162075793.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/sariwepurajudorodewuti.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c3376955171---wawaridazukasodadub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=modern+science+and+anarchismPDF link annotation
    • 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_off00027c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27C98 10484 bytes
SHA-256: e1b29d58c046b3dd1a99705ce6581c24c86d8ba1ae0eb2935d70830cad971b9b
font_01_sfnt_off0002942d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2942D 18432 bytes
SHA-256: c66cd8519fca2b1725a3d12e97a8df23519f5dff3c34a5e773dc6e861a2ae582
font_02_sfnt_off0002c326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C326 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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