Malicious PDF — malware analysis report

Static analysis result for SHA-256 161730e51ab0226e…

MALICIOUS

PDF

83.9 KB Created: 2021-10-10 20:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8d240242b3d2e9c43544476109eaec41 SHA-1: c081e90deaf3340981edaa2197f547412d298433 SHA-256: 161730e51ab0226e579dea875f62ac57629f8b1161171c8c557d18cbd4243c0f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates the PDF is likely a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=lucy+gray+question+answer PDF link annotation
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16153ea139521a---92359360815.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/60502551298.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d7162a23b---fuxowod.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/nibefojeti.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/saxemudobixuti.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/58630265967.pdfIn PDF document text
    • https://slide-bearing.com/d/files/mupolorosowebojetu.pdfIn PDF document text
    • http://unsersohn.ch/images/file/wotavifowopixatujuba.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615284325dbc8---pamimevogufixigekibisi.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/84964813281.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161560c486bcbf---zesosojafum.pdfIn PDF document text
    • https://haidangpc.com/contents/files/83532232989.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/bubinilune.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/dewireledigaza.pdfIn PDF document text
    • http://rapet.hu/files/zaruwejaxubirubamakomozid.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/videsujodunibi.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/setijotebuxozabi.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/nipojufewuzedubi.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/8183164403.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/41953293763.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/98794666778.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f98debb818---pivanulolinoxuxilutalage.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_off0000e1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E9 18380 bytes
SHA-256: 6642def486cd1d0e126dfd86e0dced048ca77308a9bbe7595313bbd1ae4a5d61
font_01_sfnt_off000111e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E5 10760 bytes
SHA-256: 10f276d0fd4e25ed2b50e3482bceb17e7fa76aad406ade61e99cd59f741324d0
font_02_sfnt_off00012a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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