Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e7347bdd41003d…

MALICIOUS

PDF

87.0 KB Created: 2021-09-14 12:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d980bcddf069346292f483f4680e96c9 SHA-1: 593f184a9f25aee625ba6411ede3aceaaae51987 SHA-256: 19e7347bdd41003de3824977533a897c1d4fc8bcecbd3baded87e3a4f3b3ded3
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially compromised or disposable domains, indicating a link farm designed to redirect users. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly suggests a malicious intent to lure users to malicious content. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/sanosujejo.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffde6713c7---betabe.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/zesomomuwowixilewisurimow.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/76893497015.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/2916948960.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/rijevovoxuwonaniwa.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/68285487644.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/pawakogezesoza.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/94625194922.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/bujenemakinakisimosolata.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161389a9d6b603---wagagimoxujelixajotirevag.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e0289b248---48608827781.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/sakuzawunu.pdfIn PDF document text
    • http://cabini.it/userfiles/files/nuwubobesizetuz.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210911_5449CD32985E3890.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/laparexaza.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130322145dc0---21509168686.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/gufifagifoxiketamikop.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210906181029.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/15470201947.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/95065395315.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/dasesodogaromilo.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/fesufupezuw.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/17826423704.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e77e26cb38---mifezesowuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=get+like+followersPDF 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_off0000f14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14E 17872 bytes
SHA-256: 3433e604cf4d8e4607781886429502131996f5b7f1fa2e25e55afc152836f09a
font_01_sfnt_off00011fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F8 10156 bytes
SHA-256: dae6e1d136b001234ce60c5d35c6845b9ffd442916d1701a1e3e8bda671e4543

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