Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a22d81a00e8668f…

MALICIOUS

PDF

87.3 KB Created: 2021-06-26 20:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47883cf46690411284ac159be0c67fb3 SHA-1: f91096d2cc124e2f3589045a865b678353dcf817 SHA-256: 4a22d81a00e8668f9d81f9340092d060f6834e3edbacd5bc171990efed93991d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a tactic to host malicious content or redirect users to phishing sites. The presence of a link farm on disposable hosting further supports a malicious intent to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/nbf71fbqdtkdu4ssnjj7p1bqim/gugupox.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1606eac2640d00---73224841282.pdf
    • https://radmangroup-ye.com/rgfiles/file/mulebogivodiduzali.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2f1aabaa0---43135190758.pdf
    • http://reicar.dk/userfiles/file/fobaxafowesadaxelekax.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaa00809b1---pikuz.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/d3caaf0684c102036aa42fea923a261d/97723736194.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/jb2cvhei82gtl1jmhue5aamdjv/45839743905.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/12298624339.pdf
    • http://tunesistudio.eu/userfiles/files/99253471886.pdf
    • http://northmarking.com/userfiles/files/76533605753.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607603ee61269---63855728948.pdf
    • http://csc0311.com/userfiles/file/20210624124859_0oy3ok.pdf
    • http://cesmclassof68cheyennewy.com/clients/82478/File/44590142333.pdf
    • https://tavio.ru/files/file/15671592245.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160961d2135050---50725545323.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8940e8e9---lajatedofoveragofapu.pdf
    • http://cocoal.com/uploads/file/wujelodenubabiwerapufu.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f39421a97f---gegurodesirivakidewug.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/1o6q24a9uptro5l5qbhlpu7so2/dimisibipu.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607724e81ae65---sonovoz.pdf
    • https://antae.be/app/webroot/uploads/file/pudojimixotetajekafok.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=zell+miller+and+hope+scholarship
    • 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_off0000f1ae.bin
083d156b65137e184711ef2ec08fe027cb79008986ce59584161e841577aef7f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AE 10644 bytes
font_01_sfnt_off000109b6.bin
e017ccb31b0945969b52a6f2e1de15b564e3756c55184b868e6f76f29192a7a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x109B6 17548 bytes
font_02_sfnt_off0001381d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1381D 16792 bytes