Malicious PDF — malware analysis report

Static analysis result for SHA-256 819d56999f9e8753…

MALICIOUS

PDF

99.2 KB Created: 2021-09-18 05:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4b567bef06ae4959942d3e6386ba4f3e SHA-1: 9b7f466d08461452f8bbaae199603760a5473543 SHA-256: 819d56999f9e875361ea25bcce76a87e01bdc5aa75461e91a8bea579fd0777e2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://xn--oy2b19v1mb1yi.com/userfiles/file/pisadokaliduzabejo.pdf In PDF document text
    • http://boek.se/bilder_umeny/File/82075988061.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/23ee0a896db8017260c5b08bec612cea/7065117300.pdfIn PDF document text
    • http://prestopc.it/upload/file/94009413971.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/mejufulugafekojokuzile.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/16837876569.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/79880165497.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/38070784026.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419d3d2aff7---93176495688.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/15818780656.pdfIn PDF document text
    • http://tiquital.com/documentos/file/mimilozetadopemepenajola.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/pitagetirakoved.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/q2r6udona48t6vjeu62gk06nr4/44821236417.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/30827056888.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/62409107470.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/11838093509.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/fugopelilapozumisiv.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/61290523539.pdfIn PDF document text
    • http://flexa.cz/docs/file/wisog.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/51176667198.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/5q5slqnef67efghesc95s88pc9/3874718648.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/43908903688.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/mumavaw.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/2a817333557287d419b3c8984350161f/59357011847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=after+we+fell+full+movie+eng+subPDF 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_off000114d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D6 21512 bytes
SHA-256: 4296160eca68cb3e9b71c20f9e33f0eb2cdc1231592879de030cdd7dbccd7be1
font_01_sfnt_off00014d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D8E 10768 bytes
SHA-256: 2e68cfb6b4e2204d5ec43d46f0928507134bdf8e18637e96ffdcb8493051d482
font_02_sfnt_off0001666b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1666B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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