Malicious PDF — malware analysis report

Static analysis result for SHA-256 9013b54e23c240ed…

MALICIOUS

PDF

86.8 KB Created: 2021-07-10 00:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 149d1c5455b1f6cdf6c520a02875ce3c SHA-1: a8d08a813ca468e0f73026ded3b9d5f764ae9711 SHA-256: 9013b54e23c240edc942b09a97cb08dc7f10b451a1c0101f668da8389ee7550b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://wastran.ru/uplcv?utm_term=pumpkin+and+goats+cheese+risotto
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/le6qgp3jquk2laj8nr2n331m2i/piwufajusomekor.pdf
    • http://rubensova16.cz/files/file/vixodoxug.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608976659f26e---63783054022.pdf
    • http://urgentcarepb.net/userfiles/file/26389287022.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160818cd9326d7---35200794729.pdf
    • https://jewfri.kr/files/image/files/gamokagimok.pdf
    • https://kermoulin.com/userfiles/file/zulajegubekovudufajave.pdf
    • https://abugfreemind.com/userfiles/file/xetejas.pdf
    • http://wjvanderheidedienstverlening.nl/uploads/file/35728522749.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b319e693aee---noguwakuvav.pdf
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/93192137444.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abb66794337---lufadujazejobi.pdf
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/40441411591.pdf
    • https://bursac.net/userfiles/file/1382771100.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160903855893ee---janagur.pdf
    • http://chickenwild.com/upload/contents/images/images/zutuwowobaxo.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607e84917446c---19866189886.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/b8tna796utbjsdn5506vpb06uu/vikozokixazusibimawipaguk.pdf
    • http://renovator.cz/files/file/7707398316.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c931391da78---252156660.pdf
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/19908620379.pdf
    • https://ebooksweb.net/files/file/viranupura.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1e146c926e8b2fc2dd639d90f0458334/begelit.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89f424e200---55492083562.pdf
    • http://loveperfectionschool.com/upload/file/29337497550.pdf
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/77200689120.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3013850f3d---xaxiremewugikasezemo.pdf
    • 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_off0000ee4a.bin
d835da34b2c7f05d62ae1f90ca4f7ea2953b86fdc651420d260512d41a97fcc2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4A 11108 bytes
font_01_sfnt_off000107d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107D4 16792 bytes
font_02_sfnt_off00011fe6.bin
bea5aef35497663a43567ece0e77956b98785770c61b59ef9332c99d6d7b7959
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE6 17280 bytes