Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7b5d7f8854e70f…

MALICIOUS

PDF

162.6 KB Created: 2021-08-08 13:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bfece12b5fef995a98353c77a4ac65c2 SHA-1: b699fa250f71fa70f9843c8438acc6df8f1ab7fb SHA-256: 1a7b5d7f8854e70fb80143a7edbcc001695d8d4aa60907ce5816eb3112886492
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute further malware or conduct phishing. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8156

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://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160761f14a23f5---paxalibiwame.pdf In PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a22f05c2d56---92396487394.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/97497112309.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/b673606f68300ab9df3399c62faecb81/kojoxigabekedovetox.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160eccfc129d5f---tanineradujopadilafapovut.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/74691364037.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae389e638d2---xopaxalur.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/14585612614.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/laximaginawunutib.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c87e6ba8e8---zaxutapelaxowoku.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/buxewuxugabapuvavagade.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/34761441246.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/6od47q2hmlsrbeq6lvv22613mh/72231502897.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/005fb78d59742d370d8c64df3f417cf7/fasewalitaja.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/1af80dabbf5a3a17c6783d2e2a1e6ca9/67281387241.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cc89ddd00---topavufefosele.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfdfb5c8d1---sufonijopog.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609649cd2e174---2705142791.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/nanisogulozuv.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021073106485273499.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/rivepubafikodu.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/30d575df9b21508f88c0971a0d77df9d/lomonimujevinodilulaw.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/joxuxeriridewaromow.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/gidogukamuje.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/743fd55573b0ed2b215548d5bafdf1fe/fuwowagoloxedadozivu.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a280bb6fb2e---nofajaxawajodupilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=who+played+jason+dilaurentis+in+season+1PDF link annotation
    • 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_off00021928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21928 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002313f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2313F 10876 bytes
SHA-256: 8e6786e854f3bbf7d60ee83957b2df807490104b58df4fe0258d4b46e97ecce0
font_02_sfnt_off00024a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24A64 18032 bytes
SHA-256: a9fc66110b94992394c2b25c1b971aeb05049526fbb9e064a96cd3e7a1af5883

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