Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78d0c5b5aec063e…

MALICIOUS

PDF

83.1 KB Created: 2021-06-29 19:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 59eaaf6fef3d10104bbe783330867c6a SHA-1: 55b8116d8f3a85c309c70e21da946741c5f2a71e SHA-256: d78d0c5b5aec063e6c422a4972c33741cba4dc9e3deed845503100e37e92e4e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://philabc.ru/uplcv?utm_term=marry+me+for+christmas+movie+series PDF link annotation
    • http://travelshops.pl/userfiles/file/fisodonemizore.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/37432f9e72d61adc6720ab82ca12b389/97823174002.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/95423141445.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/h1ne2gu40bsn5b7er71efglg8n/nufabewiwotesedigeb.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/f16cec1bb077db8b22779ee51cc1854e/kuzifikiluban.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/36189392583.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b9f557b9f---lisafanaxitujamazusov.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/58053940880.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ab5c6f2d8---sifitad.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/zaxobavovib.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210623_124439.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607015f671a21---90850165620.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/54624109855.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/tisolixup.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/66726248175.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ral1s84luv5pa8b257libnd5f6/rapewilujebumetajaje.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da80969f22a---27227464919.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/us3q0okdpcfd5g5r82e3vm67m3/38852935781.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/26e5c3492a15b11850ace314e82aee7d/kivetiti.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/gexonamu.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4b8d46909---vopufudomu.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3f2a932ee---sigalifuripized.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/wikufalud.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ekmscl55tc5j6fqqebmpq4gtmm/baluralemupifizemobe.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607681d06ac68---5041655153.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/movuzokadijigerumegovotim.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_off0000e09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09D 10624 bytes
SHA-256: ab4da3369e3c002cfa7cc5363a6b36ba29d5efdcc07400f1a6dcc721717b0953
font_01_sfnt_off0000f907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF907 17476 bytes
SHA-256: fbbf92bb66ed3329d330022d1ee311d7a56c250de185623ea81f583a1a72fb4f
font_02_sfnt_off000126e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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