Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac7c5c91d96bcda…

MALICIOUS

PDF

83.6 KB Created: 2021-08-26 04:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 700179050ca4ae19f3d0bd8000a53296 SHA-1: 9f4020a729fc8100cdfa951004a9cef3a8a592e3 SHA-256: dac7c5c91d96bcda11340a312bf8922410dc8b83c1bc347cb891436bf7a2cb7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations and are structured as link farms. This suggests the document's primary purpose is to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 https://oniceh.ru/uplcv?utm_term=general+science+book+for+competitive+exams+pdf PDF link annotation
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d68aa9ed33b---navibolexew.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608236b6deb0b---86647710331.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/176243b713fc063bd1361a0b292ec30f/wifalokigexizomuvab.pdfIn PDF document text
    • http://imaginove.eu/data/Files/gurilukovopiraropavax.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/s8k5lk6vjcfbcb91nk5pm09ufa/tidesib.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/23865132391.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/sijamotoxub.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a90fccc493---32843060919.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/42395228558.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/29507994944.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/80206979394.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/41330917402.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/31925942845.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161027b483e916---83484127671.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/busirezusejigivokep.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/laxitam.pdfIn PDF document text
    • https://people11people.com/uploads/File/30973047598.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/30687874432.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/tanudevesitonipikun.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/nolabeve.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/79817256504.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/gadaxelegewezumekobuwa.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/8739389257.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1e6e35f79---20877481495.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/luwodevapagiwokifizuwe.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802a35e1edd---mevivalinopapireminuvog.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_off0000e001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE001 11220 bytes
SHA-256: 5e0a94ea845589217acf3e76625ea81bba17432c540a95fec776d3db6d2e7e1b
font_01_sfnt_off0000fa1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1E 17240 bytes
SHA-256: 83d3bc90acc3c839e6958fe77808b7eb6220c0e01ddc3665da6ee17d35cbdbcc
font_02_sfnt_off0001278f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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