Malicious PDF — malware analysis report

Static analysis result for SHA-256 1898e5c2f07a88af…

MALICIOUS

PDF

80.2 KB Created: 2021-09-12 05:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1bc205be1e541dac21aa9a5901f432c8 SHA-1: 56856f1be90260c557c1288cc5fc927b3bf18172 SHA-256: 1898e5c2f07a88afd5f79f1dd0ac7dbda278f550e20e38081ef3b74adbf76e9e
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites and other domains, which in turn host further PDF files. This suggests a multi-stage attack where the initial PDF serves as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d21595def3e2f402e4b458a77b1ea48b/72013040968.pdf In PDF document text
    • http://tksvolga.ru/userfiles/file/vagixuzawarori.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/igk3mhno65h8tdpab0ii03nm9n/74781457020.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb19c92ead---deresobimisavimiginitux.pdfIn PDF document text
    • http://naviway.su/upload/files/jofepelofiwasi.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/renabutetaduxixuxu.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/86992927407.pdfIn PDF document text
    • http://hybsch.it/upload/file/zobomifufin.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/dawosunom.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/lokopoziropubibu.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/46659839685.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/ruwofezolifukexa.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/gejatobalire.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/mesupekexamoxepijumi.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/34978474685.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631391155.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/48926130318.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210910_fe35d.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/dulurazenovawozabasapodaf.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/famalisegezutesadomewali.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/kaxitutexilukowekepoxiv.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d58235727---82051496276.pdfIn PDF document text
    • http://fedime.org/imagenes/romelatisovavavuxaj.pdfIn PDF document text
    • http://kco.su/userfiles/file/56672916946.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/ginarudamubujow.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/tevajasupud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=android+enable+hdmi+outputPDF 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_off0000d248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD248 10708 bytes
SHA-256: d2b796e8e8e5360249e01bdbf937c77db75992c82e9e08cdf276192080641af3
font_01_sfnt_off0000ea62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10274 18496 bytes
SHA-256: cbd2700c7a118d35a34c05c4e0d40df9f2b3f50131ac39340e6a6ee38ade59c0

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