Malicious PDF — malware analysis report

Static analysis result for SHA-256 834b18fdab152209…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 20:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ca1f13dad3401a0b068abd807b4b034b SHA-1: 7241253b2f2deb3fc0adbc0c73945b78c92b8659 SHA-256: 834b18fdab1522095052c3b2b1c24bb3504cda66af821def00a3d4d0d52aae0f
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating it functions as a link farm. The presence of these links suggests the primary goal is to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/a32585dd7e23ba2926be5879e94e5a6b/69943484399.pdf In PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161379311c4949---vulidodewamewi.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/9m6unrmusrrdfmhu4ehjfnk7lq/2773399722.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142084f480e8---motomibumirivabupak.pdfIn PDF document text
    • https://bacsionline.net/userfiles/file/59949466385.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/65044406550.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/33693031385.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/wipenuxiwemiwuwegusa.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/pigimavitifajegejagoda.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zevafirugabepu.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/mijuvokulipemevojigaxelo.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/51390170666.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/zeloko.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/70064630705.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/xixodizatojira.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/vofeluxapunot.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/lurumuk.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/lezivodiwibirotoropikede.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af89f25315---24746310121.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/686382746.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/19700551593.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133db5da065d---dobesunisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=orbot+vpn+not+workingPDF 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_off0000d6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F1 17828 bytes
SHA-256: 2333f3cf83b41e23712edc877688654af34538467f1d63a12e207c9bb0f2d305
font_01_sfnt_off00010510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D27 10328 bytes
SHA-256: 129e9f098e9391b536383e342bcb2ec7992fa7b9ad68d9340454caa94dd60023