Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e4ed5fe957eb76…

MALICIOUS

PDF

72.5 KB Created: 2021-08-04 01:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 435b15a998d9500028287fe075ec6db6 SHA-1: cc93f2db2988b07301d248898c6fe1931c4d7e35 SHA-256: 48e4ed5fe957eb769f81671b74aae2f3fb4557f239b367af7e006090129e80a2
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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=isotope+notation+chem+worksheet+4-1+answers PDF link annotation
    • http://csc0351.com/userfiles/file/20210623084650_7aj46f.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/51938649754.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/73729624179.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/053a4ccadaa4f9569a4845f928879ddd/72190929075.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/furujapuvuxenamozupowukav.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/9c372cdef86f8abcc23d766c7cb45db4/sevopesovidaga.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/zosofokuv.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/83008022544.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/386545176.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160995c660b45c---jigikudim.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160841797e5f6b---redovezuxipi.pdfIn PDF document text
    • http://caramelitos.sk/files/pebiba.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d1f16188c---78962643510.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/cc06659e9b2ca442d0a203a61ca99fce/20655030093.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/8ce44a6075d8fb1f9dbb4cd08f83b466/28220829018.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/80476207182.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/73928933539.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/fuxefaxerexepelinizug.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/18491940961.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1623418171.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/98645620055.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/nusizofojelazifoda.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f4b08701b32---94094920786.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/nemetiru.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/wakipozavebofuvisune.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_off0000bd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD03 14456 bytes
SHA-256: 8a83432d59f9607022d54cd062ece29d10c3a0126abb81d7c90763aef2ce6fd7
font_01_sfnt_off0000e1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D9 10888 bytes
SHA-256: c41e04b4562b065a03859e81b17f334cff8c0552ad75485e393f053c002b6397

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