Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3031c36283197c6…

MALICIOUS

PDF

72.4 KB Created: 2021-09-09 14:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4c2fde6c1fd69041d278e8acc5010b70 SHA-1: 81d12d6e2e27dccafe202500151380d1ae88133e SHA-256: a3031c36283197c6db43e6558d45ba371e3c3c64f30ac8e61c6c51b04042626e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or utilize link farm techniques. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://agenziaimmobiliarecannavo.eu/userfiles/files/46249559940.pdf In PDF document text
    • http://evo-models.com/uploads/userfiles/files/posofotiz.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/tebogitabefidujigudut.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/sugumusurix.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/14577869440.pdfIn PDF document text
    • http://4darchitecture.org/img/all/bekeliwewemuratupap.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/pelifarowojigi.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/lukisekasijafenavejasu.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/40224189611.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/85782879472.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/85490972127.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/18693800964.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe6b235b3d---nolusobemukuketuripifo.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210907073001.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/1vje6oualsvet58ut5uc9c1ev0/buvimal.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/sibavotusegalukewetemu.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/lulibegaso.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/79821840720.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/suvivabukunekawozukepefa.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/88210745396.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/lodaremokakuto.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/bovevurowanijegijozobaw.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/tajojili.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/68f68ee0cfce989b83822330de0f3a85/90127471232.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/58510137664.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/sezekirivowun.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/aa4f8e9afdf3f65f744f2ada41192045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=vice+city+free+game+download+for+androidPDF 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_off0000bb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3E 10820 bytes
SHA-256: 3cba50152b6e9f0786cae274bd94b4479caf7dc60ef2b2b6b9b4801ec8d87de5
font_01_sfnt_off0000d411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD411 15680 bytes
SHA-256: cef455138a1bf8281a9600fe39643d3639dd82432c0c182fb546dc88abc9d7c9
font_02_sfnt_off0000fb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1