Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5870b186fcd0f5…

MALICIOUS

PDF

85.3 KB Created: 2021-08-24 17:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f61bcdca8f3f51efab994a23896d1a75 SHA-1: 0c86890dc1f1c9c1518b6b6b1ecbaaaeacaa3935 SHA-256: bb5870b186fcd0f5aa847f64cfcff7ba888c30b33566d3c744fc48b9be23d62c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm strategy. The presence of compromised WordPress upload links further suggests malicious intent to distribute further payloads or conduct phishing operations. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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=ipod+touch+5th+generation+factory+reset PDF link annotation
    • https://tailormade-sales-marketing.com/userfiles/file/bolizepup.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/wazoputoxoturi.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/icdtkmt45k5fhqqjrp7u17gtll/faderaguvedadu.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/74959268646.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/20049259438.pdfIn PDF document text
    • http://klpa.net/userData/board/file/34662167491.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/62782845720.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/zigatevesolitorubag.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/98559044695.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/qh64pqv21ugsu0k51oa5mubjsu/26800615003.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610968400329b---dozud.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/22597190294.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/26755636033.pdfIn PDF document text
    • http://splogservice.ru/content/file/12494292318.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079dbedc3ce6---17862610451.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae80b2d46de---dupunibus.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8bb94e18b---panubasujuxoxabekumono.pdfIn PDF document text
    • http://chayka-svg.ru/files/37525181375.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/8467887c3a7370ba5d357ffe549c5f27/gisexifurutabivutupul.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/bemifoxatilez.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e03374536---31058400846.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/17eldabsh44gch1ugcbggeeg79/bekomupado.pdfIn PDF document text
    • http://www.celso.org/download/5063784941.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_off0000e999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE999 16776 bytes
SHA-256: 6603ef51d8480a8d77161c90c0719b47782d9c6181c4dbc48ea13123e5328d68
font_01_sfnt_off00011568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11568 11152 bytes
SHA-256: 0b3df9c10f962f6186c661e1b6f2d9a48a50cc3991aab6db96accfe4eb3f1fec
font_02_sfnt_off00012f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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