Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1fd712762e70da…

MALICIOUS

PDF

86.2 KB Created: 2021-09-19 08:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c5d2ca35730d67a6eab1c408ce324155 SHA-1: d57e14fab43610eb42728a15fc3ac55850850496 SHA-256: 5c1fd712762e70da885bd59aa0a3a32e8819b40be55b0e1799935763cd9e6eef
164 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, directing users to numerous external PDF files hosted on compromised or disposable domains. The presence of a 'download button' lure suggests an attempt to trick users into downloading malicious content, likely further stages of malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://wastran.ru/uplcv?utm_term=sexy+baseball+game PDF link annotation
    • https://ezokniga.com/uploads/file/kozatimegoti.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/kigunipega.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/82814545380.pdfIn PDF document text
    • https://norservis.com/files/files/58860667605.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1ae6a7d2f---lupaxojekurolezapokige.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/baragufop.pdfIn PDF document text
    • http://mcutech.net/files/61264821209.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/77988879195.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b579628bd2---75607417096.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/80389681974.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/14211424994.pdfIn PDF document text
    • http://terminsk.by/pics/files/89186125450.pdfIn PDF document text
    • http://fruitsad.pl/images/file/sevowutasupotuxubedilofej.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614424ad60b6b---99347173770.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/danutukenebapibe.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/miwanerijenotupak.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/vubupufez.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/71953626979.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pegilelodasidizut.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/detofidebebibepolezumame.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/varuteporoza.pdfIn PDF document text
    • http://kdekdyjak.cz/data/82529861181.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210910230732.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_off0000e9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B7 18772 bytes
SHA-256: 418fe91ff9958eca6f73a11ad4a6bb5e26890462f0dfd65161aeb2d1ef5c1759
font_02_sfnt_off000132dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DC 10368 bytes
SHA-256: 793132198f593cd22c8f2d1708b0b0a47f31ab12eae493814708d1e3cc2fde20

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