Malicious PDF — malware analysis report

Static analysis result for SHA-256 4538114f6c5ddef8…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 13:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 14315d5219b53e76a1fdc709970bcd48 SHA-1: 9db0fb5b1313cafab8611b019021a1f53eb7a515 SHA-256: 4538114f6c5ddef8643197f579bda2d068ebf233626e578105f8559bac92b9b7
196 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a lure for an advance-fee scam, specifically mentioning lottery, prize, or parcel delivery. It contains numerous links to external PDF files hosted on various websites, many of which appear to be compromised or disposable hosting. The ML classifier also strongly indicated maliciousness, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://diphong.com/uploads/40665017704.pdf In PDF document text
    • https://kodcomputers.ro/2664/uploads/65243924544.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/zunabinuvakakenexolagezid.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/gupopujujikawiz.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/21378045587.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/dekodolokonagoz.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160975115cae28---kemebipofaxatinu.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b01cfeea16d---kopejujok.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/julipodez.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161030d9ebcb5a---63489655206.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/85424791749.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/44ee53b152f285e69130ee1f42d87ecb/15631299296.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5f767b672---rebisaguwokugibifo.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dfddd298f3a---getuvanitexom.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/16634960584.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021060804494673499.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/97523200201.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612e62b35001b---78654195519.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/555846858b5a636cd72322655e651e80/81399856542.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efc4c64b4e---11313508450.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/m2jadf0ji8bct8urjsvkd4varr/23600756094.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/83716468327.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/90348140248.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xejil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=cybex+cloud+q+isofix+base+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_off0000dc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC68 11072 bytes
SHA-256: b12e2a8c86e2ad58e8baa9273a712947704c4a700cf3561dc407c378f1bc7e02
font_01_sfnt_off0000f5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FE 16420 bytes
SHA-256: 59639dec8bc9c316ac4bf00c0a55bc3318abe478b3b7c6255eeacd44c00c580a
font_02_sfnt_off0001207d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1