Malicious PDF — malware analysis report

Static analysis result for SHA-256 047fbc7d787d1abe…

MALICIOUS

PDF

77.5 KB Created: 2021-09-13 10:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 770e9e7fe35c7e3a84e19fc7d5cdfe6e SHA-1: f98457f0ecd3d365c94a1bbd44e101909041b978 SHA-256: 047fbc7d787d1abe0f3813ca42a8a52073c9c3e382b4bf9dc86102082a533689
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms or disposable domains. The presence of numerous URLs, including one with a 'utm_term' parameter suggesting a phishing lure, points towards an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://smidgel.ru/uplcv?utm_term=free+fire+3volution+download PDF link annotation
    • https://polaria.cz/images/file/komobosimobosemite.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/41200909763.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/41091829690.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/15780228926.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/78428581507.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/52514119799.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/6020970586.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/23617001092.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/22346318603.pdfIn PDF document text
    • http://hrudolf.com/userfiles/zezinulivem.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/28059391403.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/82294820959.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378edf67efe---4279890725.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/33555081118.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/givaluda.pdfIn PDF document text
    • http://domplus.su/userfiles/files/xisopiroxode.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/c7bbd593547d0be92966dba8677d9aba/507186365.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/27523087119.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/45032234189.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/pimatebupifetaw.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/mupegefamuninavekulofe.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bbff09aad---wunesaxupenizovurug.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_off0000c999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC999 17816 bytes
SHA-256: 5fcffa58e67409b9e1f09f0362ba3eb154f843b164ae9e58982d3d0984f04d4c
font_01_sfnt_off0000f7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDC 10580 bytes
SHA-256: bf76f11cbfdc674ba80d7afe7d82e2020f3aa3092a6b9383d01e859a40eaf595