Malicious PDF — malware analysis report

Static analysis result for SHA-256 be62de6e1c4d566e…

MALICIOUS

PDF

85.9 KB Created: 2021-09-18 08:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fbb7bc6b4c795c279c89343be97f7528 SHA-1: 87f94415be708882190172ec6fd10e322e2c9878 SHA-256: be62de6e1c4d566e82a5f1ac684501b582518b22ca55b67879dd0ca59c416de2
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 executing malicious code. The numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, indicate a likely phishing or redirection scheme designed to lead users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://cructi.ru/uplcv?utm_term=using+android+phone+with+mac PDF link annotation
    • https://minervatech.work/js/ckfinder/userfiles/files/75149080040.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/80761190315.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/29015475492.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133008d90a13---wulutolil.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/jaxiduderubaxelo.pdfIn PDF document text
    • http://irollee.com/userfiles/file/ziribarebowuzogaraboji.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/c72fa67a5a51413c522c2c5b744f78f2/5399490999.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/8655642288.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/rasuru.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/61931952511.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/raburulelazenabuni.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c15ac6200d---13930397124.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613593e2dcce0---52705673611.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/p7se4glct5jbqidh9mpn4pn9di/ravov.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/ludizejofiwo.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/2sb4m5075bdh4s8a0s6u3ltmb7/zomovenas.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613413235af2a---54539094462.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/vopaxosodotejake.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/55948399373.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/28944970140.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/27764127414.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210901113755.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/vaduwemota.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131b04465e59---16411664245.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc0ad9e2ea---33352019209.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/mufetagonebomupeful.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_off0000e9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CA 11008 bytes
SHA-256: ddfe388d3ac2f9947ac762bf9516b79bd067d27c7eff2802da5786e9b90a1182
font_01_sfnt_off0001030b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030B 17956 bytes
SHA-256: c6f431817daed7a04fc633a05e06f5c6dfef38ddc49ecc69fb63989841381e47
font_02_sfnt_off00013201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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