Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fac5f57ae644b72…

MALICIOUS

PDF

86.6 KB Created: 2021-09-12 00:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1568a26389dbc517c6457509df4aed7e SHA-1: d089bc81d69aad0bce84e4911e1d3ec612a0b1f0 SHA-256: 8fac5f57ae644b72f34f54a271f7150ff233cab793bb62e5505a76b8945d55b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content. Heuristics indicate a high likelihood of phishing and malicious intent, further supported by ClamAV detection as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613282912ceff---11010717794.pdf In PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133f02c07ea6---sanimudivazuvodidozidi.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/vubolawegasaxebafumibo.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/69478938550.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/gewoxese.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/71020122101.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/lubituguxesipoweno.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/nimadelimabelunawamoni.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/radotasaz.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/64245619515.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4b8d0a23b---pirotajoti.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/lonubefi.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/gatita.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/wumiweziteridowe.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/27611317470.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/94472127998.pdfIn PDF document text
    • http://hidramaco.com/files/files/45033283394.pdfIn PDF document text
    • https://phukienbep.net/media/files/dupekobasisadubuvevamewe.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/17944269993.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/guxafaxoj.pdfIn PDF document text
    • https://taperagi.com/contents/files/jamakodeguvatodobaji.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/sefenoditunigukigo.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/votuxefawadisikigibub.pdfIn PDF document text
    • http://lblussana.it/images/file/18672447249.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/xatezirudeneloredu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=stream+kimetsu+no+yaiba+moviePDF 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_off0000e1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EA 10808 bytes
SHA-256: 90b9f134ee271327759d646682bf12b43fa9a59f4fe3eec3e4d4e73494bf52c1
font_02_sfnt_off000112e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E1 22096 bytes
SHA-256: e82d3bdb037756a09f17674ad425f0c9ca7d6871823ebdbde76ea3dce8877f69

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