Malicious PDF — malware analysis report

Static analysis result for SHA-256 14f71b107ded154c…

MALICIOUS

PDF

69.4 KB Created: 2021-09-10 20:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b63b8129580361b5431592d1f7ed64a8 SHA-1: d7874dc8034110e27f944e10c87ce12b417c1291 SHA-256: 14f71b107ded154c73172ac7827e474f021606d252fa835bb04d25e32a58d93a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS upload storage and disposable hosting. The document body was unreadable, but the presence of numerous external links suggests an attempt to redirect the user to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://grnca.org/img/files/files/34326549889.pdf In PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/15604459731.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/febawujudikigarok.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/92586359506.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad1d48bfc1---80229713843.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/85445362874.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630711527.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/24800793707.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/10298011684.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/59406401346.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/e09877d34858db342373b8eea55fa1d9/20737884553.pdfIn PDF document text
    • http://zima.italie-ubytovani.cz/data/file/bokabifegorema.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/47110504103.pdfIn PDF document text
    • http://hydrem.ru/images/file/fufusebixizejujera.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/41926113594.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/29853860565.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3a6d567f5---vivufabawuwulutupi.pdfIn PDF document text
    • https://baglab.pl/galeria/file/famubuzofujebonowuwoj.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/68978109512.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/90391461266.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/60917136512.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/muvug.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/k7lgmreotijvm02nj8tb1qbdut/40958548973.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/vitasiterilalofute.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/966637062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=moto+x3m+apkPDF 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_off0000b2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC2 15380 bytes
SHA-256: bd9b4cedea86a2a16699405062c43a0d2e4086410c6e220a2fe63e237db7a3df
font_02_sfnt_off0000f1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 10128 bytes
SHA-256: 80ce968e72c5f02aa128ffbead51bef563cf615266930ee03819a25fc04edd1a

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