Malicious PDF — malware analysis report

Static analysis result for SHA-256 4428a5f63814d36a…

MALICIOUS

PDF

92.5 KB Created: 2021-09-06 13:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 46eff2b0cc8405f3529c9d986c42f2c8 SHA-1: 413ca5e072f29df98a3e3a927e0b85057a2cac91 SHA-256: 4428a5f63814d36aa1f9ed58a9254fbed1612f517ea34505fa3e71c6f074ffc0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF format itself often leverage JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://smidgel.ru/uplcv?utm_term=manual+cursive+typewriter PDF link annotation
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607940404e609---tulonuzufodexesebozep.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/xamexaw.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/32396447748.pdfIn PDF document text
    • http://heureka-cz.eu/files/23815434887.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714de9d320c---10718884147.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/65047700438.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/l8abirtb9dbvno5fv76sjai6i3/53004236947.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bufutidarojorofegu.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073c1b168a03---9364243302.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/90745954489.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/burumekafuzifofezalubidi.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/telulewoneduririxo.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c154ed13487---98875439429.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/29485714978.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771863da986---lagefikututujulolanobakov.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/97776601399.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/buluxibaxevemo.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/28827266858.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ed0dc7fa9f22fd677db432d7efcc23c7/1671111639.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df5781e75fa---21715912079.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607433a73c684---33725259490.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/61536279686.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/87872289234.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e4db49ad7---pasotami.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb0087b5d3---zuboviredewanagilegenovu.pdfIn PDF document text
    • https://bonacorsi.it/file/57666461116.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_off0001058b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058B 10604 bytes
SHA-256: d51c0dc28370762c8e6efa4fefef1598d0cef4ef5c697f2eb766c8459409ad31
font_01_sfnt_off00011df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF9 17580 bytes
SHA-256: 42d9b854d9df724df32f11d8d97aa2110e1764408330eb1ad472b102f4c2f448
font_02_sfnt_off00014c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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