Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d47be111448ce6…

MALICIOUS

PDF

72.4 KB Created: 2021-10-02 16:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c281bf0d70fc23c8e702f91257a0f9ad SHA-1: 0330da457eb4c4bb83fac331793763294e2f4f54 SHA-256: a2d47be111448ce6ee3063e1fe1357cece7ba892da26172dc237d1b709121570
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=essentials+of+educational+technology+pdf
    • http://longarmacademy.net/fckeditor/userfiles/file/54355342040.pdf
    • http://wawabed.pl/uploads/userfiles/file/kozofezawimi.pdf
    • http://gerd-pollak.de/userfiles/file/ruwawexumabusawubikajiz.pdf
    • http://tsuiteru66.com/userfiles/file/68374378432.pdf
    • http://nuklearmedizin-amro.de/userfiles/file/sosilulixisef.pdf
    • http://papaicountrylodge-longstay.com/user_img/files/xepujamibobi.pdf
    • http://mcutech.net/files/23399350219.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd75dda5be---xilerogufesimubegijurona.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151cf08f3e34---12145729284.pdf
    • http://coyada.com/up_images/up_images/jimixufogal.pdf
    • http://tion.hu/upload/file/vuvemorilovuzes.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139a51f89ec3---43217808518.pdf
    • http://merwepizza.com/upload/file/tusagipuveda.pdf
    • https://zufiks.pl/uploads/userfiles/files/pubopekolikadaroxaziku.pdf
    • http://caogenzhiben.com/filespath/files/20210923150450.pdf
    • https://semagro-msw.ru/pics/images/file/sebawujosawere.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1b008c600---pevukepexegabagi.pdf
    • https://robert-zauer.cz/userfiles/file/56017960107.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8605fe83ae239b86dfc233d7301b57ba/sovabusipuxujonab.pdf
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/gixotivuratodunaju.pdf
    • http://kamerton.nl/clientfiles/xulivozovejeniximopa.pdf
    • http://sujitonweb.com/userfiles/files/vizoxopozomifawuposusal.pdf
    • https://eco-translation.ca/upload/editor/file/maxepegosasis.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_off0000b4da.bin
4169e9e589ed6df083746bdde363019d1842ce9b4e925ba3f1ca288718df21b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DA 17832 bytes
font_01_sfnt_off0000e29b.bin
cbf0c33dc2d5f74e48cb0cba0f6868d80deb7a39832ad3120f7de7b24d872f1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE29B 10996 bytes
font_02_sfnt_off0000fbf2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF2 16792 bytes