Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb54d44af4963ba…

MALICIOUS

PDF

94.8 KB Created: 2021-07-06 22:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4c20ce696137b09e9e130fd5475442f SHA-1: 6631b2e50e1dc44e307386a1dde35f2c9c819dbb SHA-256: 0bb54d44af4963ba85374ba92ac709656d2efa0110050acd43ae255c680dde03
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS platforms or disposable domains. The primary purpose appears to be to distribute further malicious content or conduct phishing attacks through these linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/31884af5b487668770be83bad9d232cd/46223062427.pdf
    • http://newgatedesign.com/Images_upload/files/77369753322.pdf
    • http://ruihuitax.com/files/file/46005591328.pdf
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771d443e24d---55374903235.pdf
    • http://artospace.com/pics/file/73702774523.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/a87c902e969f6a3e93e9dde25bce3c93/botatalubawojujijule.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a50b93bbb---59477325281.pdf
    • http://designpavelzapletal.cz/files/file/lunumesijazularusa.pdf
    • https://khabul.mn/mmpa/userfiles/files/wovoda.pdf
    • http://trustarshida.co/cache/fck_files/file/kakede.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075860e6b823---78834791767.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b55bc6cbc---69343113349.pdf
    • https://northcoteplaza.com/userfiles/file/66646795366.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/4t723ahqmdeh0uunvcp36sdru0/69005648930.pdf
    • http://gapoom.com/upload/fckeditor/file/41689532490.pdf
    • http://slsnn.ru/content/file/gewuzexosedasa.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16076793b2ebaf---ganetimadizinatu.pdf
    • http://georgeandmaryjones.com/clients/f/ff/ff66b05efb8f16ea353d8e6908bb1429/File/vaxuxabosutaxibanawipig.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/0a50a7c4ad6b8c49f6c361bdeb874c27/merukiregovosuzobara.pdf
    • http://orkoien.com/userfiles/files/muramenatepopelof.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160988d7b50ee8---fagazoxudojovotineraba.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/2688c81a596f2019cd26e6a887681c2c/50443399236.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=george+santayana+quotes
    • 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_off00010ec9.bin
7f5d2b6cb3572bac49d6fcbdfa8e6fed380cb8d8f65bcb760d9b228c31e80b30
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC9 18544 bytes
font_01_sfnt_off00013e8e.bin
1c2f6dff28d0a70ab3872d07d4128609362aba3e404b138c159e764e86f40bc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8E 10544 bytes
font_02_sfnt_off00015681.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15681 16792 bytes