Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a7552987c8b8892…

MALICIOUS

PDF

71.9 KB Created: 2021-05-10 03:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: e8856f147a96c70c196356a55a5cd1f3 SHA-1: c7101e03874cb66edc955a874137c878f6bf69f5 SHA-256: 0a7552987c8b88926fcdbafd51910e71dadc994bf75b43568fda8c33e4b6788d
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. It contains numerous links to compromised WordPress sites, suggesting an attempt to distribute malicious content disguised as legitimate downloads. The presence of 'Adobe reader original version free' in the document body further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093b2d8da8cb---80585602274.pdf In PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021051008320073499.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/d72c1488da3bed142df642a640c23040/93474650077.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2e70ce5e4---gobavuwujejenagitozibu.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/be092f77397a95e58523bdc8bcfd8c77/36371250042.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a8755809d---96768253610.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089c109b160d---bajojibimumi.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/b3843f75e4b6cb35a1f0d9e3f085588d/7354978748.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabe167037---48414945248.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/29464569713.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/064884b0ef060c37d74625f02e426732/menozagoxijogutemoj.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/81957386789.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/c3a09fe169cf73f619d40bba39b3a104/jelanoxetaxititiwonop.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088046eb2e75---sovobajejari.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/disujaginavaxegawuxamifo.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/dekalololetalelo.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/tixufuzumojuwuduv.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/xulos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=adobe+reader+original+version+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA7 5264 bytes
SHA-256: 338a68a9c818b9f567b7f0ee0e1bd102581789e26f4116dee9c2a7e7b22d0ffc
font_01_sfnt_off0000efa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA0 10456 bytes
SHA-256: e1878a59ee40b77429f462600847956b4b908e439dd7beedc09fc6f102aa7c09