Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af670906dd07f72…

MALICIOUS

PDF

76.2 KB Created: 2021-09-10 20:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b198250dce49b657d170ee2236e02c88 SHA-1: 4b0f264e18c66ca58cba83637c9dbf87f7b5ec5d SHA-256: 7af670906dd07f72a5ef5ae16d10e1524b37df2caecd3646dcd1db0e641b1759
164 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm pointing to compromised websites, likely intended to trick users into downloading malware. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a 'download button' lure further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://thy-environment.com/userfiles/files/37419795025.pdf In PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161344d184f5b3---27423076866.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346cf398729---ziwixerexomezebexali.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/pekozonizonevezej.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090215364236.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/mitawominozoze.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/6285088037.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/52579292197.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/tuxalibobebimifikipam.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/41025057246.pdfIn PDF document text
    • http://word.mn/uploads/assets/narosiga.pdfIn PDF document text
    • https://o-dance.com/upload/files/41653575293.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161397e6d3452d---menaxufabo.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/29929861349.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/f1622ffd33c9220c5ae028d5f80ef7b7/47775732592.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/bogul.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2c428c365---65937224124.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaf0d43779---44642676685.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/muxadebudekurururez.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/tipuxetepadazodojenoxase.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109021658101834.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/gusixusudojunijegike.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/92450233627.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/xoposixowubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=android+phone+photo+recovery+softwarePDF 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_off0000c68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68C 10916 bytes
SHA-256: 899ead813d296e27bd9eb5be0aa01382f88bffa0b197e50ca68c024ec70c5ce7
font_01_sfnt_off0000dfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE3 16964 bytes
SHA-256: b162424df367e5f5c4cfec22e665140aa306f5b95b525e341f44ad344e383fad
font_02_sfnt_off00010ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1