Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c75e167f206b43a…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 16:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9aef4ad13486c592e0dd21674f0abec3 SHA-1: 35b80e76c16a086917459b0e5f85ad39438fc5b6 SHA-256: 1c75e167f206b43a588d8a30938bd65a4c64f0fd38721589154e4f91271cd812
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. Although no scripts were extracted, the presence of numerous external links and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document's primary purpose is to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://caycanhtuyhien.com/uploads/image/files/silijezufiliwapi.pdf In PDF document text
    • http://wadsoda.com/UserFiles/File/4869768448.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/puvatupobezar.pdfIn PDF document text
    • http://ccsl.asia/files/ralifitesufemisar.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/bulipefiru.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/goxaku.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///202109044851_239730008.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/xugijamasisiv.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/notubesabafuvuzagosudez.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137429840bad---65352289529.pdfIn PDF document text
    • http://prestopc.it/upload/file/14803903825.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/linolu.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/dirimejosufa.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/82828350646.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d16c85deff---xewatajifixepap.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd782a8643---85440438729.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/pozunuvuwojamova.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/tunonamovoxu.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/16683685460.pdfIn PDF document text
    • http://espwireless.net/uploads/file/83087017582.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/jukoxeresikukodipizewo.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/seguwexaradefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=descargar+gta+3+apk+datosPDF 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_off0000de33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE33 19252 bytes
SHA-256: 30a89acf3e4e3d8e6298d12c19bf0dd2f2a5cc5a935e14fe328642fca0a619d0
font_01_sfnt_off000110d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EC 10712 bytes
SHA-256: 4030ff210800648fc1f989ebc42dd33716adee0cc9118448dbd14ceb058f0366