Malicious PDF — malware analysis report

Static analysis result for SHA-256 34fd55513dff1fd9…

MALICIOUS

PDF

83.1 KB Created: 2021-10-04 18:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b02708167d612bea614ad7c4c642dac3 SHA-1: 2ba6302e6d65470da70d4c94aafec5adf2f277a5 SHA-256: 34fd55513dff1fd90a4e074355c917fcc705f684cc08801c98c4facb82146840
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains a link farm pointing to compromised WordPress upload storage, specifically http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161588aa9800a9---81868495042.pdf. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161588aa9800a9---81868495042.pdf In PDF document text
    • https://ecpa.fr/uploaded/file/89718464371.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/nulemujidaba.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/c7210839249bdac61223b0063ecc8421/31350522448.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109140851365185.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/rekolaxaru.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/pugosivudi.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/521b3b0240bcbdbddf7e750901e1772b/rotigefogosubalepomep.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161503a91c5a31---taverelegamir.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/wilunomejotovefufedot.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/benawavu.pdfIn PDF document text
    • http://sdes.in/uploads/36595327811.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/65883948431.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210903094751.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/vokeriwug.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/53532933339.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/dimobekasodu.pdfIn PDF document text
    • http://air-ned.com/uploads/files/7789573326.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/9c18cht8ljva3d2itprifn5897/rawobubawagus.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/51551961119.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210913060942.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/wupofexexitimuwalu.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2197103c5651887fa519da360aa33543/zunovexaronimezuzorodexuj.pdfIn PDF document text
    • https://dukupahit.com/contents/files/60364074137.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/37371709504.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/28793828720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=it+would+be+ifPDF 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_off0000dd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0B 19512 bytes
SHA-256: b62bb5c1de4badc30014740fac5c45f3ab6b75fd0dd5c8696636f740f58e8fd5
font_01_sfnt_off00010fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE6 10088 bytes
SHA-256: 7316f00aba536b4c9dca1eb6db8715e5b5385e61c9f57f18c77c00977d200bc8
font_02_sfnt_off00012689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12689 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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