Malicious PDF — malware analysis report

Static analysis result for SHA-256 706ffa0fa551189c…

MALICIOUS

PDF

87.5 KB Created: 2021-07-09 17:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5bb8f216b1b57845d063b056fa87b68f SHA-1: a90733f0b9e69f833dc6013e893f5f8d118d5261 SHA-256: 706ffa0fa551189ca1023ffc8ae4c305f4d2be34f0ff1cfe64986c0937ada3eb
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used for SEO poisoning or distributing further malware. The presence of a 'download' button lure reinforces the deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://asianmosaicnyc.com/userfiles/file/gekibogutazukux.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/bd4d593314de1faffac32ed1fa82c9e4/jobawuxejamaworuveze.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/joperixenemovenufebed.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/80479718198.pdfIn PDF document text
    • http://accessoriesunlimitedinc.net/catalog/file/kasorego.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5e1a0ac57---gilamixone.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb3f93524a---gadizibinux.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722fc724dda---57435721482.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9082764124.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb15b7f139---senazaluvuv.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/f0759d48b7265d865a0680c822af6966/14674903783.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/zujavituro.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/fojeda.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/20659268178.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16091bea136066---3266078900.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/7029076959.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/80501120004.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/xokanakutagibomigudelivad.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/24098494871.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cbc159fb5---gisetek.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/namixeparilipegiserajikiz.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/15e97ddb3f704429c677ecc1ae04cc7b/wudujesaraxigefivosolafej.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/85298060627.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/33069478279.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8df73bcf3---besebajuvexuselodilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=free+ms+office+product+keyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF118 17960 bytes
SHA-256: dfce17ed9d2a8ba437db8713a410406d4a270fe9ff0a75449dc36b45fbafb143
font_01_sfnt_off00011f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F93 10752 bytes
SHA-256: 7d2c65a3f443ce1831de0a07bc5afe7e67a1690cc7c21f58ab9a0b39536d67eb
font_02_sfnt_off00013865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1