Malicious PDF — malware analysis report

Static analysis result for SHA-256 7106854beb130088…

MALICIOUS

PDF

86.5 KB Created: 2021-07-03 07:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2719001d70eb178063e249083f1803ca SHA-1: ede95c0fdca30b272ba2326b852003202082e011 SHA-256: 7106854beb130088f932987ef47cc32b840df2e1a8ff8e83889f4831751631ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the links and the PDF structure are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://archism.ru/uplcv?utm_term=hiccough+in+neonates PDF link annotation
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/8fc1d2c7396dc8b02ad8b091935dc124/xulitugejekezodafi.pdfIn PDF document text
    • https://taperagi.com/contents//files/jekimuguwe.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/mid417pnu86cm8jcarl46kulp5/38884412154.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/14490104130.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4ea453ba7---23808512653.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/0daafjrdml3i5dl6tfcd8kvsuj/20447395289.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/nevikomosinenod.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/zisaviwejefevunivuguje.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/98000276160.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/5101581967.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/11613364594.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fca31de042---wevun.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b052a4be45d---wizotepudokunitekewijeku.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ea5f60f76---14894504809.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/3tfseed03utv9mcqmuadqcn7li/28170628955.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/r6vg0s3l9p0ev2034gnjjahu1d/takajivixuranulibimijaf.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f3b0168f36a540128e411798b0239178/xalam.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/a14f9a0685f834cae289b585d4ee9fa5/19548108144.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/37221517937.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/43f66622b9542d291f4d35c98efee634/99287000029.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084753e470ae---lukikerozadomi.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/jonitovawute.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc53203201---49636321595.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609846983ea53---neboj.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/50313454370.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/delasotijubadivaboviwo.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_off0000f235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF235 10456 bytes
SHA-256: 7cff63450c98558c78d66844d91420306bacb2ca65e6fd3b86c5982b0a3e4fe2
font_01_sfnt_off000109e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E3 16452 bytes
SHA-256: 61aba73319644d670161943ed9ad941e270c0dd2b07abb1a6606ea2fe3d67e18
font_02_sfnt_off000134b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1