Malicious PDF — malware analysis report

Static analysis result for SHA-256 18313e4a19507724…

MALICIOUS

PDF

69.8 KB Created: 2021-09-07 13:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 79028bee608a83588e16c72175281946 SHA-1: e899d00594b6b6550167618e507099dd799b458e SHA-256: 18313e4a195077245a11a760287f94addd84e68a7582a0046f52dedf6acbf832
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded action trigger, a common tactic to deceive users. It contains numerous links pointing to PDFs hosted on compromised WordPress sites, suggesting a distribution point for malicious content. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://abwmountvernon.com/uploads/files/63012836871.pdf In PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/dc56b40412e0ed0755f4a9cd1a748da6/78830806741.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/gotafisobozopixadakitetej.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb9acd3caa---70744769441.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53602493960.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/9600abf9471058e7d1b4ce1c935e79cf/disoremejub.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/nulewuzovupokadonituzewiw.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/vesomakazemazafunaw.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16072f3fecd7d3---86295238821.pdfIn PDF document text
    • https://nada70.org/userfiles/file/jebujixojimojimo.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/37711469673.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/gomukoguselogomopod.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/marofolet.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc37d473dbc---revevatel.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/fajasodezijilubaxukexeb.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/rijobozujaf.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/161061cba66c99---21921258259.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/wigatimubogekuvavuros.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/42479c8fca2da831c43d923281dd51e1/3714056094.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/73191316331.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/92807937066.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/o31hjs1ad657hbdi8inurijl12/siwefopowijo.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/69704163305.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/85559923999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=fluke+360+ac+leakage+current+clamp+meter+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_off0000b390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB390 10968 bytes
SHA-256: 9f96f6881d3680118acd8a89278fa1cdea63b95b3413783791bea1d78195ddb0
font_01_sfnt_off0000cd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE521 13904 bytes
SHA-256: d02c046fc72099d82a843d50836c1efd449a800a1cf711b4279ec8811220485b