Malicious PDF — malware analysis report

Static analysis result for SHA-256 87558de73e3ba80d…

MALICIOUS

PDF

87.4 KB Created: 2021-06-28 20:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4b6b76a2783bbc4941a82a57ef8c1480 SHA-1: 73843fc9e48f4e74b2a28d4063887442848826a3 SHA-256: 87558de73e3ba80d42bcd4ffdee0d9e57e3a454ce48b0a14272fdf0e3b28fe43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress installations, suggesting a link farm designed to redirect users to malicious or phishing sites. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=free+streaming+adult+tv PDF link annotation
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6c414babe---kepavadetabojesuxujod.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wafur.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd340db072---31298865256.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1622284183.pdfIn PDF document text
    • http://jarosi.hu/files/file/71630135844.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608abacf01207---vidumukevojajutaresoru.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/e3c176b3bc53a4785a9ba81477859522/govotenudonu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c37db0f5c881bccf78dc31e2bcab5dbc/5477729512.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b589624600---12891138915.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c173916b2f6---85326035898.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210612_487C13E6CE217BB4.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/g6cvh7d15dujb6n9lge10mbtdf/95988006187.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90208393f---bemon.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/aa1ea907e72dba0bbd17dad8f0001f9c/13884325392.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/73688149822.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a705148b9---motobaperomodapenirurepe.pdfIn PDF document text
    • https://activepymes.com/pub/file/20768058191.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/86454502701.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/8iv4b9adfus8ds5a2dbv9qfgoq/livedobamav.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/jezekabuwolewerijoj.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/baseroluginajesujuneva.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/kobebojefimumuravonoxife.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/1e24g9pl5ak0226u0m5rqgv4k3/41632657697.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/5b6hpq01fhhs2hhr6a01eov9d3/nikurawaju.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_off0000f2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A1 17436 bytes
SHA-256: 7762c8e9b2dc127848f6859e08541cba5598a05050b3ee3cd0c7d52412292e8e
font_01_sfnt_off00012037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12037 10616 bytes
SHA-256: 6720267a66f86572ac666d9ddf0a6a80c3f9c1b181106af6ba1fff5e9bac4b70
font_02_sfnt_off00013843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13843 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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