Malicious PDF — malware analysis report

Static analysis result for SHA-256 6081615054890c70…

MALICIOUS

PDF

81.6 KB Created: 2021-09-15 11:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: df46c5044a193b5022295eba42fdcb31 SHA-1: 1f7c984b5e95a2b520bcf165c8d3cf205a6e9783 SHA-256: 6081615054890c70cbeb66bfa24ecddf3803f3f32a5c1bfb4b47ca86af8d1a2f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious content. The file also features a large number of external URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious destinations. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=transporting+a+fridge+lying+down PDF link annotation
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/15142702329.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/51137982354.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132e9a4dad1a---54709273830.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139069ba5826---zuzitarenibefawabom.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/84297465565.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/duwapulomiwil.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/86763179668.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/budijenakugugirapobuwa.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5atduns4cpghjj0nhs27hdh4a4/puvijojopodaxarebuzine.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/marawek.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/63557696129.pdfIn PDF document text
    • http://lecostationery.com/files/file/nanafagitojutixezuluzig.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141673885c89---89914207586.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/fanizoruzunivudabewikoxam.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/xogiv.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/vufur.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/kawavonowilux.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109090659553119.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613983c6dc09c---86945518110.pdfIn PDF document text
    • http://healthywithhart.com/res/file/6022985805.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/19040809755.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/vabun.pdfIn PDF document text
    • http://alltechsro.cz/files/13254810644.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/tuzejaxekevirotamapibesa.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/terikokom.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_off0000dab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB2 17440 bytes
SHA-256: 11ff57edc8fbbf677d573bf37e2019fa16c3151f473f0bca911a2f9b210d0a45
font_01_sfnt_off0001078b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 10836 bytes
SHA-256: bab837e91caa132e437d04736622fffbc6fd392a0379fd9cf880d0a6c9d5e35c
font_02_sfnt_off0001208f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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