Malicious PDF — malware analysis report

Static analysis result for SHA-256 a892cdade43cfa7f…

MALICIOUS

PDF

87.4 KB Created: 2021-09-01 04:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: cd603dd7a6ef52744c277aaa980a3a23 SHA-1: 38b9e40208893ce43b13da364a394d96392da327 SHA-256: a892cdade43cfa7f04ea201a2b841711c0f104e3c4dd06744420bb0fa59d66b0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=best+round+for+long+distance+shooting PDF link annotation
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f2b22c3e085---87118282959.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5e599b0e0---56673287407.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/49689240748.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/mitagudezapomikubefekar.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607c08b81d686---gokogiterofowupar.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/87625510981.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/cfb767d9e49e0a61f58934a14dc5e32c/xedevakesixiwef.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-05-26/images/files/vijetebotulup.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a489dcadde3---datesarekiwa.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/56456300102.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/sivejol.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/jusozadenujarafilapadawoj.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160865347ea25a---relasagiwijaforexe.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4036288aa3edecf5247c2b53a91e2cca/lolijufafizaxovavu.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/264c56f5c6bee81d7cb9ec8a5092653c/zitawepejapefosugew.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/xebugedaxeriz.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/51328147584.pdfIn PDF document text
    • http://srhs1980.com/clients/877094/File/pezibepezazituw.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/29073746490.pdfIn PDF document text
    • http://myphamasia.net/upload/files/41587714128.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/4cda9060f25041fc37b14ad95127ad94/lopawadezoxazeroj.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/68078192441.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/492ba6f48e78090ec42b2435d41021a9/96892105419.pdfIn PDF document text
    • 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_off0000eec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC0 18344 bytes
SHA-256: c2f87b9a47a5a6f3f5300d990b10b6d7dd7fe3f9c9bf2c037f26e32e8766536c
font_01_sfnt_off00011edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDD 10908 bytes
SHA-256: 1c1353feaa623aa03069d27efe9c3ae022494b8118ae22716499e844ec43a206
font_02_sfnt_off000137de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1