Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a478d217468e170…

MALICIOUS

PDF

73.5 KB Created: 2021-07-13 02:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b450e8dc22914babb1568374b93e9605 SHA-1: e458aadde9a13f800e7606d5eaf5d47c0a8789af SHA-256: 0a478d217468e1702a71d20ac99876ea8dd8672292ee1ab26aec9407fc06972f
156 Risk Score

Malware Insights

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

The PDF sample was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and potentially disposable hosting, suggesting an attempt to lure users to malicious content. The presence of external URIs and link farms on compromised CMS uploads strongly supports a phishing or distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://thaoduocvn.com/userfiles/image/file/totepesumalolenadagofufob.pdf In PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c57754a7b11---xavewuxal.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790a5a8e0a9---15672923560.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/30062513893.pdfIn PDF document text
    • http://texmet.pl/userimages/file/teletofanagexididumu.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b6312697ab0---vufirexo.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769378ad7e7---lozizabofokasegurujug.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/kabojuxudirixuzikuve.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/rejemi.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a8d222cb1ec97ba65086cd1e0274b592/fumetimetita.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d637827e1e---39110374160.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6558e20fea---rerax.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/inno8m8s7ao00d8n4i2ql1bu50/mivegezupan.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/18432335028.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/lufedisoxodabiragonefu.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607638cf32de9---5370835076.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8b6d98a3b---5782770777.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/241901015.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a99f3c0717e---91390682833.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16073fe1cb4deb---64043709063.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/28728217651.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/jfu1njd1vpql23koe1175ku782/tufakazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+hack+3dsPDF 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_off0000bf4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4F 16276 bytes
SHA-256: 368c29b72ecfc073644973d44314205087afb1bdb4304c9ecc937f80dfd7d795
font_01_sfnt_off0000e984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001019b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019B 10332 bytes
SHA-256: daa069983e5be9791605e0cd03ef26df600eb717fb0adbdee13ba65a9e6bdce8

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