Malicious PDF — malware analysis report

Static analysis result for SHA-256 084dcb9d8e76dc90…

MALICIOUS

PDF

92.2 KB Created: 2021-07-22 18:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 013651f878fd0d433ae88a9c150c0076 SHA-1: 9b57718fc7eafc4334ea9bbcf2cc1101ec4d8e61 SHA-256: 084dcb9d8e76dc9002c360aa5a16f04f141ffd89c8c3e99dbd200169bc187f57
164 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 websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download' button lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://juhaszautovill.hu/userfiles/file/komutujesifilejisutiki.pdf
    • http://svsteinfurth.de/radsportfiles/file/89518864921.pdf
    • https://rsun.pro/admin/ckfinder/userfiles/files/dimilak.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/1b537de72b0dd3ca939f8c7b81b4afd2/gureboman.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nidutidukunexumipudapute.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/detafajuvivamonataku.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/nc465cfan9eeja6k4a8dd5sk05/49570324923.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e795d118e---92005239400.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/d0b60c4e03e268c00c5bb1273cd2e944/16982692580.pdf
    • https://safrano.pl/userfiles/file/46234105690.pdf
    • https://e-fasteners.eu/media/file/kapemigagoxufebopizegow.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/699b2138c35d83973a0e31fd27ae6df1/pekiwapumukemaso.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea1cd28a0d---96235947058.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/rlorsbft897naaq7us6ojl3im5/23655685675.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094c403aeb9c---bonorumutadakawo.pdf
    • http://sanmargholidays.com/ckfinder/userfiles/files/14897641047.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/fk1752dfotslvmkk7t8gli0s1p/serena.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/58ead1fb0036b752b9ba8fe65f4c6d0a/zumunekipanureru.pdf
    • https://rajakeempat.com/contents//files/norafolugixesofiba.pdf
    • https://ludifrance.fr/userfiles/file/97969426669.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16088a0929f6d9---detepug.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c5ef37994---favokixuxakadek.pdf
    • http://domainecomps.com/documents/files/sutukebuvejobonovu.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff392d9421---rorimigikepulukitiwovi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=rtl8188s+wlan+adapter+driver+windows+7
    • 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_off0000f966.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF966 16792 bytes
font_01_sfnt_off00011178.bin
595eed7dfb2f3ae28d6d283f5c651b3ea69036c7658c9f9be1cedd5b088bdfa4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11178 21744 bytes
font_02_sfnt_off00014818.bin
065f93b8177803f122095d2f5d4241d8ef62680b9372ced599872709069930f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x14818 10892 bytes