Malicious PDF — malware analysis report

Static analysis result for SHA-256 9063aaa61738916c…

MALICIOUS

PDF

75.5 KB Created: 2021-08-01 16:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 563044348122e7a4d0567502adc45cc5 SHA-1: 381e653c7fdba052c1baffa39a2c5266400f1423 SHA-256: 9063aaa61738916c149950e227f68b8857bde173890a74dc1a9dfbe322410028
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate that the PDF also functions as a link farm, pointing to multiple distinct hosts, some of which are hosted on compromised WordPress sites. This suggests an attempt to redirect users to malicious content, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6d37f3fc2---diker.pdf In PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/6bf2935787d5eaf3fecf724dc7ca566c/javaviwomakudu.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/29160029360.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/84240985800.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/91146193988.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077e2bcde71f---gupatavoz.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/4fa70049870ae9b555869dfc94fdcb84/koxajofem.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ba796bd7e48---90601329299.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/46762849341.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/xukites.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/trq6f2rh3vneksrh333h75joot/16673289349.pdfIn PDF document text
    • http://cloverdiamond.com/file/77869754888.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/bonowowepape.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160733406641a8---xafikusu.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16090c4e79ac1b---fuwogip.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/d3e66e22f3e3244e5eb0a1bfb2e6ffe1/pigigemedupifuwadin.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/20543104440.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/50983700465.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ead02fb8f---petekipuwowatugaxibuzuda.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/sivobi.pdfIn PDF document text
    • https://soechi.com/userfiles/file/dexugukibukekifuj.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070e80715bfb---38423346386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=harry+potter+hedwig%27s+theme+noten+klavier+einfachPDF link annotation
    • https://mediaget.com/userfiles/files/rulagovoki.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC203 11452 bytes
SHA-256: 08b3dfee8006064fea23e6706e03c30fd306f6560d301e40685ab14c49b58d63
font_01_sfnt_off0000dcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC1 16952 bytes
SHA-256: e6ba802cf8ab7995e92d2df0e64ac639a2b037e1d32c6b6f6141507fa274ce77
font_02_sfnt_off0001079c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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