Malicious PDF — malware analysis report

Static analysis result for SHA-256 281fb357259b7030…

MALICIOUS

PDF

71.4 KB Created: 2021-10-01 03:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0e0043989491829e16e846391d79b83a SHA-1: c71263f578e2afeb6c38c790ff4f5c2ae4e6ac03 SHA-256: 281fb357259b7030178ddfe91cd55ef354c0dc0230970a3a2f1eed9393e41a9e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a large number of embedded URLs, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites. The presence of QR code lures further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://inwebjor.ru/uplcv?utm_term=apk+de+app+cloner PDF link annotation
    • https://lifeteacher.tw/uploads/files/202109260011274467.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/25fgilqp1kajlm9ku7blmv3rhi/9486376220.pdfIn PDF document text
    • http://jinyezi.cn/upload/1827406259.pdfIn PDF document text
    • http://canvangdientu.com/images/file/disudiponewilimede.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/vudobikunonetijolirituf.pdfIn PDF document text
    • http://manhtreminhduc.com/webroot/img/files/20810435173.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/d86b1e2ec24cba2872d0edeeafb820ec/zexixozepefarov.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/1d51294f719d2c640ba73f59d463f52b/rewudo.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/sepajakirinoza.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/rufodewetadidasalogakiruk.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161474504a6db1.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/99855104420.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/37666880807.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/18409985743.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/fixovojoboregekimenebili.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/pulotadasut.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/mejomu.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/77020231397.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/72348923686.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc12d6a956---wotajepotasamububurek.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/dipisa.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/gozixavebojugekosu.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/pujibonawetosirakadiso.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccd35ccd14---kalez.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/10104240292.pdfIn PDF document text
    • 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_off0000b45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45D 16684 bytes
SHA-256: da5859d2ed8944a5114219abf64665a68bb4aa32602f0f92e7c3fbf4d2718274
font_01_sfnt_off0000df5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF771 10220 bytes
SHA-256: 1a60c17db2d126d95d1ce300f3102eb3995108b79cd7c5dc9c60f75828592997

Open this report in the interactive analyzer, or submit your own file for analysis.