Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da420c68733ef1b…

MALICIOUS

PDF

92.2 KB Created: 2021-07-01 10:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 591b02e506ac45ded5c4a897abae912b SHA-1: 266b2d87daf59e6f6d8318eff630b5dfbd15ae83 SHA-256: 3da420c68733ef1b675dd5d64f8a8489e3c5ad9a1cb9f34b7b2f70d052b3a413
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS uploads and disposable domains, a common tactic for phishing or distributing further malware. ClamAV and ML classifiers flagged this PDF as malicious, indicating a high likelihood of malicious intent. The embedded links suggest the primary purpose is to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/78524728622.pdf
    • https://alexandrapanayotou.com/web/images/static/file/xutowamabopixi.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2861cece9---33908887371.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/3426bc09c497538ead1a76cfd0c3e268/fenumomuwotajefi.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/3881fe61169861f4af19388748640327/rawowotirawokizimekegux.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b7292845411---45536439027.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7dfcbfc08---kegevalofebarigutetegep.pdf
    • http://csc028.com/userfiles/file/20210626002800_swjz5v.pdf
    • http://mygotour.com/FileData/ckfinder/files/20210623_80E96660DBE08396.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/o5oltprphtdpvpshkgl63h6qv5/86573540457.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/4b156d42a9722e13f6b5066b0914a1da/71803854876.pdf
    • https://alexandrapanayotou.com/web/images/static/file/54939452757.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ad75c8a26---27789088819.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/j05ql11pe7q7pgv9over03r4t9/winixizuxusib.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1c9f6044b---bazixuravopenili.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe708834c5---bositusojiwijekidane.pdf
    • http://evpltravel.com/xv_image/file/70725443348.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/e0b50p98pshki9516mjusqkf03/34017603875.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/33d66eaa76547797c59e15796149ab9c/82069357039.pdf
    • https://mzlpro.com/web/img/podborky/files/30569357304.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/8338b63671271c7eb512c7b0904e3791/55811244616.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c62bb4572a9---pupaporilojizoburuvowajus.pdf
    • http://keyflounge.nl/userfiles/file/45319777361.pdf
    • https://angkorphotographyguide.com/userfiles/file/sikubimowixurevive.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7fbf4db9643862646c6c1685739d6264/38553531462.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a66c20c8aff---namujago.pdf
    • http://windmill-bv.com/userfiles/files/4885757194.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=paired+t+test+calculator+using+mean+and+standard+deviation
    • 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_off0001017b.bin
01ff862c1aff418e6d286c5cbeca2f693e2d8e0493bee186eb4a46d28ab04ef6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1017B 10880 bytes
font_01_sfnt_off00011a66.bin
ade21ef4381232a627796118fe6a35f2fab7f1a698c4f909f1ad75035e0f3984		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A66 18192 bytes
font_02_sfnt_off00014ac8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC8 16792 bytes

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