Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb0c65d01a534525…

MALICIOUS

PDF

83.2 KB Created: 2021-09-21 02:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 89643e7a357bdff46c785e2effa2b94f SHA-1: bae7f019742ea1a10968019fa4f103ca8a530d10 SHA-256: bb0c65d01a534525529f680ea5fb1607fe225f77cbb93e5a2f1611e307084c08
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Numerous heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, such as https://laborke.ru/uplcv?utm_term=wink+fun+video+chat+app+download+apk, are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=wink+fun+video+chat+app+download+apk PDF link annotation
    • https://jatransfer.com/userfiles/file/66337815936.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142f9ac2fdcd---52814459140.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/zefezudulinuvinadevivuto.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e33b7b14df---suruvaxugivuzukuzakisojem.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/gagaxiwitixomebozeb.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161398c990b6b1---sifebavuzigolifig.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/fadiluvetobekipevijus.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/monizosuzitiwemamebavolo.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/61389403928.pdfIn PDF document text
    • https://wita.lt/images/files/dadaxelotadomiwo.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/tisakezisafovevug.pdfIn PDF document text
    • https://biodez.lt/i/File/39946114645.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/81260552366.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pogugawabudok.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/pijadowe.pdfIn PDF document text
    • http://oodow.cn/upload/file/210911205515272754gfnwwakw0wl3.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161482e1dc5614---50935128399.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/88364989420.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/pemeven.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/24842035380.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/suponu.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/56713689684.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/d89a7bbb06fa8ba8fb486d0d805edb05/saxorasufenitivojog.pdfIn PDF document text
    • 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_off0000e13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13B 17072 bytes
SHA-256: 693d672b370a3c5652d8dc84aae41d14e64bdb92a53154a8242f88d645974084
font_01_sfnt_off00010dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCB 10784 bytes
SHA-256: 6b30ae3b66a72f0ee820acce89f04fe0797e4665692882c953060803bb6da1a9
font_02_sfnt_off0001269a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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