Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d1d8d9f78591d9…

MALICIOUS

PDF

82.6 KB Created: 2021-09-09 21:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 43ed207be62ebe8bfd4e6ce3234d2282 SHA-1: d34bd27033969d1594e56a35006fc66f580cd85f SHA-256: 43d1d8d9f78591d96f020ea29ba95f1e998405af3267d7d0a9728b31c970f930
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to lure victims. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/d07ecf58197a851949aacb869ee2675f/60935344245.pdf In PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/21969843418.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/44423882784.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/wafusu.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f47c7e0605---wujuvalugekixeviki.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090719531273499.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/wesewuvikefiwatetinep.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/banufok.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/pubadode.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/94079926497.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/dotadekux.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/161303e6b775d7---38391135115.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/movepavafomezagugi.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613518fede271---xidaborilujujomob.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/1780728253.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72468599047.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/72407717050.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/26465955268.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/vupazoloniko.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/94441464028.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/75690966987.pdfIn PDF document text
    • http://ihdbd.org/upload/files/92101753682.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/darixuzukorupete.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/66956072882.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/sepifafimexamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=convert+multiple+pdf+to+excelPDF 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_off0000dc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC65 18152 bytes
SHA-256: 07b6b370feaa9932b36b29800a241f59da4973b3197e74a6b4e1932e045d4704
font_01_sfnt_off00010bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD8 10752 bytes
SHA-256: 5913bdadbe5f923fa812a25f24e5f9dc5c43f0af57e7462d429153c7251d2b02
font_02_sfnt_off00012496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12496 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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