Malicious PDF — malware analysis report

Static analysis result for SHA-256 2076afad6e6f3049…

MALICIOUS

PDF

93.6 KB Created: 2021-07-07 14:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4de8529afbaee524ab436c38f7a3ceaf SHA-1: 0ca6220834be0f1bae5f7e95142d05c95b1de671 SHA-256: 2076afad6e6f30492c8fb468a5d54fdc90e3ea8c0db158166821504f30c2233b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's part of a link farm hosted on compromised WordPress sites. The embedded URLs, including one pointing to a raw IP address, are likely used to redirect users to malicious content. No scripts were extracted, but the PDF structure and heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766f20ecb17---98599499488.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa9a4a0d75---wafagomegigoxakig.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608742a91f6f1---pinudusekidow.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/nulinavedotaxawidatakak.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/l63iv30jdai74o96eil2btjdof/51276404507.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/8c56ss2fe5aolcceuoem4000i4/92522925093.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/ececc1af30c729e3f617e1e6f69fc2ad/sabubusewa.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/minerarinawuzo.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/kegetexi.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/362c20bdd781e0fb9c8f768c04abeab3/bulobuvopalinanezuxu.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/f20f34f83217757aba0faf5a86f55595/56688745315.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/kexarewajufimosukik.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/t82k5h784b14p8k6vg3flo5qlv/lidurolu.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d87d1e8aa3---68324685714.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16099bec4d55f8---dasokowewedomaru.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160907f1568051---lileponifowowagudidawim.pdfPDF link annotation
    • http://escuelasfutbol8.com/docs/files/xodopulizemunenitazen.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/weveboj.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/nujedajikafelasizofenol.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/70856801155.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/0b003983e6ab6b27a96bf2abb9bbfce3/netof.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/1e4eec2bebfd759c04e38046b5bf0d1b/kavitufutizevewajaf.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rei4f8smg12n0k77rhi43mdpd3/gabefo.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/6790dd51aa2b2ed173a1eaeeadb07319/nozekatiza.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16082e831f3267---xebetasuxawegepa.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/phskugd1dqic1c4c0phi667r5l/54210313704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=current+trends+and+issues+in+nursing+administration+pdfPDF 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_off00010a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0B 10924 bytes
SHA-256: 1c7c3a69496075d977434b4aa683c914e4bbf6fb6a0be1bbf1e5bd1b9ce2572b
font_01_sfnt_off00012322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12322 17188 bytes
SHA-256: 2f7473d176e7540b28f322847e663fa55bddd9638e007b023b38bb67091ed6b2
font_02_sfnt_off00015064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1