Malicious PDF — malware analysis report

Static analysis result for SHA-256 0841aac145451208…

MALICIOUS

PDF

93.3 KB Created: 2021-07-26 11:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 8601951e9029ecc056f28f5cb363d5b2 SHA-1: 7696dd79ea629b7588473ae34e7919718167c102 SHA-256: 0841aac145451208eae646f2d4955a9b96019c1ded695da9b886fd3a5129cd0e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting it is part of a link farm designed to distribute malware or facilitate phishing. The presence of external URIs and links to potentially malicious files indicates an attempt to redirect the user to a harmful resource. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5da9d2325---falikolebowiko.pdf In PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/b6d73399116e1d2ac118ae7adbbf87c2/53846714227.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c7919b99f7b---soxujopojudobavivef.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b638d2a57---pilewinugibonagav.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/96887030961.pdfIn PDF document text
    • https://aquatim.ro/uploads/files/fosubaboju.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eb007b210---83632486221.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85b44ea66e---jewisubifiripaxutizine.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/pmko1ke361apfb4k56mk0gh1tm/31985878243.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/o5a3unb392a8dgp55rimh3g2g4/34651330718.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/nanize.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/sekuwetinig.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/jttu8a1cg9mf1cvaclimjmm6o2/92720582262.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/rgarirk98utpaj18mb349ipgf5/96402016983.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/liver.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094295791c51---8531657408.pdfPDF link annotation
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdf2ba1b8c---zezikarar.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/9233377239.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/11719966435.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60FB287F2632A.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bb893c84f---kutifidipewiv.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/14547518831.pdfIn PDF document text
    • http://expresskaliski.info/file/foxefawalakufazuv.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/b7d813f1811b0af8cdbc9ac531f57ece/nafovebasokojiwu.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/251a91ccb70a0cf30298a772264db15f/66260100739.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/32907230371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=excel+for+dummies+2019+pdf+freePDF 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_off0001054f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054F 11064 bytes
SHA-256: 7d5a5879ab997c5af78685b5e2a9aa3dd72ec4dbe6b83ce23883fad0de1910bf
font_01_sfnt_off00011f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001373a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373A 17432 bytes
SHA-256: 3f0ef8a095a3d3be29162cd6ee12accc96a144252eb015d16da891db04c81674

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