Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c8907811482cdc…

MALICIOUS

PDF

78.3 KB Created: 2021-09-20 23:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 92b9317a7b86cd5d8ec52d6058049065 SHA-1: 9e824cab0f7564598fd4ddcca1afe799018172c0 SHA-256: c1c8907811482cdcf709324ace12f19b49f571a6403c990bdcafcc91ff4a950e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as Pdf.Phishing.Trojan. The embedded URLs and link farm structure suggest a phishing or malware distribution attempt, leveraging compromised websites and disposable hosting. No scripts were extracted from this sample, but the overall structure and heuristic firings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://coretry.ru/uplcv?utm_term=the+sims+4+android+mod PDF link annotation
    • http://bagiez.com/userfiles/file/kupipelanitiwabukoto.pdfIn PDF document text
    • https://sealskinz.ru/files/file/lawuvi.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/bulegejawujabivawerisar.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/13160050908.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/keviju.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/pabavutaxukerajularerino.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/d3cf2cd7d69811e53739bb77ce329c64/tukebilezefetujemafipe.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/d163e60813dae85cef24b54d15aec463/78683978149.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/dikuvebufox.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/gojifoluwubo.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/68206363103.pdfIn PDF document text
    • https://senfina.top/uploads/files/dexawax.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/8816001784.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/kidodedudil.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/344569827.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/fonezatajerokelawinun.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/vazafufubisonasujiroveg.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rizolerowodibizonusijipi.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/4771754635.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///gozijoluvakubezuguboweg.pdfIn PDF document text
    • https://angkagenap.com/contents/files/wafowap.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/jivorevutopak.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/48944684897.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146625d09e60---64398718840.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_off0000d032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD032 10412 bytes
SHA-256: 075fb2d2d3d5fd6f5f4825eaf2106f9431d42cf6f9c82adf2bbd936f862fe4a2
font_01_sfnt_off0000e79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAC 17028 bytes
SHA-256: b2841b48b4ea7e5681e561d87e6dfe9a28b8142eef9f8170a53be967f33c308f

Open this report in the interactive analyzer, or submit your own file for analysis.