Malicious PDF — malware analysis report

Static analysis result for SHA-256 7edbae8ee84010eb…

MALICIOUS

PDF

73.3 KB Created: 2021-09-24 08:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4a61963281138844102b283ccdf9ac98 SHA-1: 7219bb285fd8b12301d4456a584b52f3fb57006e SHA-256: 7edbae8ee84010ebf66be9d997f91ae1401325e8dc0467463ecabe30c56fcdee
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Static analysis revealed it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links, including one with a 'utm_term' parameter suggesting a phishing lure, strongly indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://queure.ru/uplcv?utm_term=the+latest+version+of+android+operating+system PDF link annotation
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/86792394792.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161454df266ed4---ranowad.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/rovopigojekigazinonero.pdfIn PDF document text
    • http://exim5.hu/_user/file/79466620522.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/kejazozem.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/81708621982.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/vusokugulexolodur.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/wewutalanamomar.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161457899ad1e8---73951860996.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/18559259449.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/fejorisezoguselexijezow.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/wadufonalulavuvuwofudu.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/75784679700.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/43371715100.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/tekozoji.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/ninavisuzodovobone.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/1305779571.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161444d85b9c57---14408138484.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/sasasetime.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141f2c443c01---95597392714.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/85482454322.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210916131219.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/77942773776.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_off0000baba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABA 16760 bytes
SHA-256: 5677375b8950f500b33600ead57497b6cdb8bea6d51defe2db277f0d22f481db
font_01_sfnt_off0000e639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE50 11088 bytes
SHA-256: 54e2fece851fc44608356ae53a6dd40fe5a138fad30a160a366001671557818d