Malicious PDF — malware analysis report

Static analysis result for SHA-256 581ae82fd328b7c3…

MALICIOUS

PDF

84.0 KB Created: 2021-07-01 11:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33032e75b7ba4a6d637fa3b70b728711 SHA-1: 254db51c8383df4e04d33b7a8edad156e3b929c8 SHA-256: 581ae82fd328b7c3a3c217645b1a701a99e5369650aa3acb7bb2c6c1d3b7b85a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://birkhoffhi.com/userfiles/files/sivir.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c916fad816---zawalajoduxegekabalagul.pdf
    • http://www.yoko-ono.be/images/userfiles/file/9029698014.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608284d03c868---61842688585.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa60fc6322---mamowomi.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/lovsm5tv0c1ioird8k0ihfvanu/gibinakamagejikepu.pdf
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/16655297406.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728dcd35e49---60536914535.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/9eba61ebfdff5b04e168e73f3c372b2c/ratizevodizenesuzifi.pdf
    • http://mmckno2010.zkosuchdol.info/files/lopimavamuresemeg.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/0c93a508d9b1debfbf3965e102e60dc8/12452201147.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608138d240f88---55495976220.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s5f1efoqqlva5peoovcetrg7s2/24508657330.pdf
    • http://innovad-ltd.com/userfiles/file/kupadagimefopajuwofiluze.pdf
    • http://bloomx.com/sites/all/sites/bloomx.com/files/kesavuzovaniniwokitab.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/3ffb93bec5f258bd9dadab30a966686b/mojebizeboforomoro.pdf
    • http://kppzp.pl/userfiles/file/15301422207.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3313fd1df8---89220889686.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075de3a04a01---fulurafesaxov.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16093b0714e404---23245016647.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a075d69be---90026370505.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=tie+up+loose+ends+meaning
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e56d.bin
68daa1c5e7c8ce0a3cf667ae9b14e65cb02c38b5b14f4a78f03667516bebbc09
pdf-font-stream PDF embedded font (sfnt) at offset 0xE56D 16948 bytes
font_01_sfnt_off00011187.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11187 16792 bytes
font_02_sfnt_off0001299e.bin
1847789de0f6caa16f59575a214cc6791b48e198c00ec10f445580adecaeb3a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1299E 10600 bytes