Malicious PDF — malware analysis report

Static analysis result for SHA-256 e535bd7881243dbb…

MALICIOUS

PDF

92.8 KB Created: 2021-07-29 16:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 01f3768a5e79f07bbea2272d4f00a289 SHA-1: 791fa638006caf66efab1750ae3203a2a1a56c71 SHA-256: e535bd7881243dbbd56147c96185f516be4cf069ee1751c9ab116dbb88053dc2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or SEO poisoning to drive traffic to malicious sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://horizontire.com/userfiles/file/kogenigoxiloxomif.pdf In PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1b1c14f8af59c4c6e374bd9152a06e9e/nolezunanajewopam.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33e66517d5---14497995763.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/xaganawajumapotubo.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa784b167f---wegibuxevonoxofegubulot.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/89074198303.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160928a8b3b15d---47523517248.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/bpmrviskgbt1hpp1ssafdujtaa/10143081378.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/metozekewuga.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/73160092235.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/b76360656e6e36491d7c3eb81b59c537/fetijopogidu.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f9402479c6e---14415804959.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc8c7e52b0---gavexeso.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/giwenetoxexakabejumale.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/gawesiwexezowemezafuta.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/9chtvbg5c9gjqe15rfg0gid71l/kuribidesaro.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/vp7fdt9rpda5rif1ia96b0kf49/57008946159.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/47926850020.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/d3c9d12202ec4c4387c92dc4a066bda7/wufeperoximosedoparagawi.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/a94d6e8fc68d873708edd4d90b1b9d95/84431121469.pdfIn PDF document text
    • http://normel.org/files/upload/file/1302900903.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/24498987889.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/kalb58i5nvvkb79k2n5qgokav0/74722022720.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/kakebuvorogivera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+twilight+saga+eclipse+full+movie+download+in+hindi+300mbPDF 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_off0001032b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3D 17560 bytes
SHA-256: fd3e78d3f038b6180f9489469551bb9173fbec285b5315b9f47c8026c23866fd
font_02_sfnt_off000148ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148FF 11616 bytes
SHA-256: 6089effbc63533db42059e34a4edbdfd3b9dba5f1a376faa515db08be19ae9a9