Malicious PDF — malware analysis report

Static analysis result for SHA-256 552af1522fc23034…

MALICIOUS

PDF

113.3 KB Created: 2021-06-26 16:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9271264787757f3c365620cdd4af85c2 SHA-1: c7c08f17c141c38121544cbe9ae81fe226e4ac19 SHA-256: 552af1522fc23034f7dfb3d044f0f49d2c671bd97230329191acb92ccf747860
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO spam. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://cructi.ru/uplcv?utm_term=types+of+retail+store+layout
    • https://bbpartner.cz/userfiles/file/72282147551.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/222aa4558e7c5fd3e331057478e3f957/pizafonaper.pdf
    • http://toyteepee.com/uploadfiles/file/210510142445965146hfy9hb.pdf
    • http://mkngsp.ru/upload/files/9208617260.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce54dc8491---77709817722.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/552a33b45de0df066461b42accbbbd61/pujusigatexivosasovagipe.pdf
    • http://zge-led.com/luodan/images/userfiles/file/pukenuladarekitopomo.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/4fa5cb8e0420bca2ef2a9fe1a66da713/vobazaruguzufa.pdf
    • http://anvlaw.com/userfiles/file/xiladejoxigolaxu.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/6vu36kr3hequ5l01hof3d4p5uu/weragevazenujavufu.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0bc260369---34812482262.pdf
    • https://alternativecarrepair.com/userfiles/file/84761751835.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/117a8402b65f952fff15e2998566ae02/nowogijojigewewinavidaxig.pdf
    • http://mxagproducts.com/upload/browse/file/31628111581.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608012cec5758---22832094731.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/587271526b2a86b9f609aa86e00d481d/zofikoxeza.pdf
    • http://vogiantinhmach.com/media/ftp/file/24915767859.pdf
    • https://psystat.net/candyticket/uploads/page_images/files/24436226468.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/0efd2500d9933e0fe5bac1e4ca0d3b11/4530494087.pdf
    • http://ruihuitax.com/files/file/10338529680.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d04f02ceba---29385460773.pdf
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/61917760750.pdf
    • http://geometrabottero.it/userfiles/files/xireneful.pdf
    • http://neodentpetrosino.it/userfiles/files/mamukituboli.pdf
    • https://natyabio.com/uploadfiles/vimuxekegoni.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_off00015a69.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A69 16792 bytes
font_01_sfnt_off0001727b.bin
34efbb43f8a8b040eae0d8ee50178f7e1cbfb461f579917ef1177059f710e656
pdf-font-stream PDF embedded font (sfnt) at offset 0x1727B 17360 bytes
font_02_sfnt_off0001a002.bin
d52a15899d767abe089d9e6464ef4bcc31c80104234e2a0c7e97ff37f6853903
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A002 10424 bytes