Malicious PDF — malware analysis report

Static analysis result for SHA-256 9019e00fb13758fd…

MALICIOUS

PDF

86.8 KB Created: 2021-07-07 11:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: abbc2960c8987739ed671e60e8682508 SHA-1: 66da8d3aca55e97ec072e43795d490a7e51f28c6 SHA-256: 9019e00fb13758fd1233e824dcdcd8bb952d80bb4f8f17312493ad13f5679728
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to trick users into downloading a malicious PDF. Heuristics indicate the PDF itself is a link farm and hosts content on compromised CMS uploads. ClamAV and ML classifiers confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd0d478de2---69091243691.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a331a4255ca---26984637214.pdf
    • http://tele-fonika.pl/upload/file/9499019014.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a717e7e7f51---93932606631.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c85773587---timimofeboforigefero.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/lhq2if22scffqtrdd81q37h625/25680417386.pdf
    • http://xedaptap.net/userfiles/file/bufunibewixutifokiz.pdf
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/buzibifabivojes.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088f940c85b7---57294489304.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68411d4e11---famominub.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/4bbb9bdb73b458ed449e2acd38664bbf/75465888975.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607169d2ca08e.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad988f8dff6---20249146111.pdf
    • http://logisticsnetworks.net/ckfinder/userfiles/files/87712233209.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c0dba5f8f---53804387891.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c404ca04d---zitowovixazin.pdf
    • http://www.europesolidaire.eu/userfiles/files/39103996926.pdf
    • http://www.chubsorn.com/file/files/jineledibofomosokizon.pdf
    • https://dgaspcsm.ro/ckfinder/userfiles/files/doguxozefugagala.pdf
    • http://cupta.org/userfiles/files/20210701194339.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d80b0f16b---memegujapatesiwo.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084cb51a7b10---lipojaxijezopoxegas.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=outlook+vba+save+email+as+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f321.bin
9ddc998533c216c5009fa3e65342863dc945653561d231ac5f3ba51a2f97b219
pdf-font-stream PDF embedded font (sfnt) at offset 0xF321 16504 bytes
font_01_sfnt_off00011e09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E09 16792 bytes
font_02_sfnt_off00013620.bin
3a17a701d18618844da1a800ef3d17d3cdcb9aa12670f6187577db587f62a92b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13620 10880 bytes