Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15abd6868eb8ed5…

MALICIOUS

PDF

79.6 KB Created: 2021-09-08 02:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3f0ec56710be0d6dc6c73ba607a3066 SHA-1: c635b03b4173240cb996c5b58fc2a76f03640b5f SHA-256: c15abd6868eb8ed5636b13d80187d4a10a38ea90ff1597b4a6517bdf96b2966f
164 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of a link farm pointing to compromised WordPress uploads and disposable hosting further supports a phishing or malware distribution campaign. The primary attack vector is likely spearphishing attachment, with the PDF acting as the initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://amphorabeautyclub.com/campannas/file/39678641598.pdf In PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d47d8d4d8---bufofisonemitazu.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/86281859701.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/82597562322.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd12323d7d---divevebutujenoxenixebafe.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/lalufegowa.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16078873f3f7f0---77058043742.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/wotukuxowasisiromawun.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607fccb1bd47c---nojepirevogugubira.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/fa67caf0d9ffff5674d852c188824768/39337502112.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/bonuxisokumakamomami.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ce97a66e431---61360410319.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/bg2spve9om4m8qfq0bthk0jrbo/zijulodir.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/27014766117.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/21572356750.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/divotutovutubawabixo.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021050307565973499.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad68956ed92---lilenipoxivuzivibob.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/jomenepekexijitowin.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/905bdffadc27c431a58889edf22c3e31/46149121967.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/dujaxojotomaxazawemoda.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/zamefu.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607beea3628a7---newumizojufosufuwopor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=panasonic+toughbook+cf-54+service+manualPDF 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_off0000ce4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4A 18236 bytes
SHA-256: bc013bfbf895b20363c3b321e8d3eb8dd24d63ad746b3e1bc4d01d3e7e0a3a13
font_01_sfnt_off0000fd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 11428 bytes
SHA-256: 9999f327c6b054f83cc53ab5c9eb244daa1c87cb8ff61da409d879fa67039fe0
font_02_sfnt_off00011867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11867 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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