Malicious PDF — malware analysis report

Static analysis result for SHA-256 51cca5668f35a557…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 08:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 35406f567fc1e009d6027dafe2b8231b SHA-1: 202152e819c7acc0d03469f2c69c662a78f3ed0e SHA-256: 51cca5668f35a557f1926ea9bc67d6f82631466710d865f22ad7f01b60f1e31e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via the embedded links. The embedded JavaScript may be used to further obfuscate the malicious activity or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • 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://smidgel.ru/uplcv?utm_term=espresso+machine+manual+lever PDF link annotation
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/uvse66up85po81emde97b9brrc/88190832384.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/89027543856.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c5078c137---nitavebalaki.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/1so39t2btrtspahoc9v5sfttqn/sedesomagopunobifibiw.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609e02ee0c12e---bekevedavukepebibe.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/mugopakukilonipetona.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/12997442264.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16072759f9e6a7---87819834525.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/58fbbf75ef683d06a5aaa594c8b6da71/fagidinevetokitijub.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/rozizaruvovilugumekig.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/17546818652.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/0db49ea135395bac32dfa1984ed9d505/84812608633.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/nosozuvunuropofa.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/jopifodugemapujamusi.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/kezolulenefa.pdfIn PDF document text
    • http://trevorhannant.com/85055574126.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f41c32a0b0---45451807569.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/teminadewun.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/60177712536.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c535d676ee6---50359968545.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/6875250746.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/fkhsai2f9eh7sj27f16cn26me6/18643540864.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b46628c4b---98311728458.pdfIn PDF document text
    • https://ecoretras.com/file/76786370772.pdfIn PDF document text
    • http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/64521533618.pdfIn PDF document text
    • http://dges.in/userfiles/file/58218493734.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/bi3vkoa1c1fhkqig1f8tfl0g7p/laganoretebidedumakogemez.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_off0000dfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDE 10688 bytes
SHA-256: cd71a5ae9e9f7405b12231d471aff7c65c3cd7eff38c4d65ab9db42c76038e80
font_01_sfnt_off0000f826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 18560 bytes
SHA-256: dea6488912cffb0765a4dfca678cebf31613a67d852e954c66398b01de6402eb
font_02_sfnt_off000126e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.