Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25b52bc7a29eb43…

MALICIOUS

PDF

113.2 KB Created: 2021-09-07 20:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f0e2ba7b7449260461d81a77470aa4e SHA-1: fab3a909f08e8d6f1027f98c73cded783fce5fdf SHA-256: d25b52bc7a29eb43339bc3ebda2766195bc3fbb5f792365d92ea2738366699a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised CMS upload directories. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the distribution of malicious content via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://samtekelektrik.com/files/vilijibifikibexadaz.pdf In PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c8e3822d0---58135139648.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c36681a24d---topadatisupo.pdfIn PDF document text
    • https://comiconfezioni.it/file/gazokenepigoripob.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/77b456661aa9bb26fd99102475aff057/minirosebumobofawedelifo.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/2b94c622942078486528ce85e9545883/41085994190.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/28684599038.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/50add8c887374438b25bf64c216852fc/40581202241.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/4025fdcae1f4661172cf136d84f11c88/xosezuzidigepe.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2e706ccf1---fiwesoxomakexe.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/xogamiwiruxewezu.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/88b34ee22bc34ace0d952c9a9f3baa1c/23086754077.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1622140469.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082110ed1f69---mivudinigatefogog.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef80be491b---muwazixobes.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ef7a8de26---56601444205.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/bunukojipufetogiv.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/61511783787.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612690109aa04---bapirizatipepanimugibut.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/razatiligokam.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e15662d7b7---zasadezunopalokab.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/16383123104.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc31f7697c9---pamomuduzonaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=baby+bestiary+2+pdfPDF 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_off00015635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15635 18444 bytes
SHA-256: 8239ed7704927e8281a0174bd08afb1495b124efb96373031922031f3c41e2b9
font_01_sfnt_off00018605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E1C 10648 bytes
SHA-256: 194b4ca9cc83536eb23ae954077abdd25e2e75cc64ac88d3a0b0dd49788f44c3

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