Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b1a1de182aeb39…

MALICIOUS

PDF

76.9 KB Created: 2021-10-13 00:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f6a07dc235ee532092f23527f3fd9fe3 SHA-1: b5b7ccfb6dec7e8ad061c818eb42e6c677b477ae SHA-256: 77b1a1de182aeb393e7b220da8df3234fc9a19a0f988985d47db4ac6d19a4288
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a significant number of links pointing to various domains, many of which are identified as link farms on disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of numerous external URIs and the 'link farm' heuristic suggest the primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://mibenjamin.com/userfiles/file/lopunowawozonotol.pdf In PDF document text
    • http://autolubitel-irk.ru/userfiles/file/lowetujuxil.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138ea247998d---vitisotedilegelerin.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/83096220737.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/watosop.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/7022669939.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/xesarilewivanezibekifaji.pdfIn PDF document text
    • http://kechengchem.com/upload/files/67192315943.pdfIn PDF document text
    • http://euphoriaclub.fun4two.pl/uploads/assets/file/43280277377.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/66529017231.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/gapapu.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/doxixosevita.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/e45bb7f1ac369d5ea40cf4fd598bde0b/6518207768.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/95578914664.pdfIn PDF document text
    • http://soc-in.com/data/media/files/lelolizomavuwoxeb.pdfIn PDF document text
    • https://beaszemin.com/files/tuginuna.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/18795436425.pdfIn PDF document text
    • http://briztravel.com/upload/files/19650433512.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/8a3a600ae95ca2bf6d07ca351c57c681/47318255203.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/15466122752.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/gobujivizigewos.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/52006518466.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3ba2c75d4---xixik.pdfIn PDF document text
    • http://kyokushin96.ru/admin/ckfinder/userfiles/files/dupax.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/d3a0f1c8e64631455b603294030ebb6f/dipivemurukuselamabuxosu.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/58618211374.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/RC0zOYPQW8A/uplcv?utm_term=watch+the+perfect+host+online+freePDF link annotation
    • 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_off0000c77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77B 17848 bytes
SHA-256: f1b9c5ca20efd1e7659ec7c1b248fac857068a36c562e7e0c5f0379c0d6ab357
font_01_sfnt_off0000f585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9C 10572 bytes
SHA-256: ff567aa13274e89ccc643b9ef6398b33ae7f8b342a7aa5c8f66bd80896d58ac0

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