Malicious PDF — malware analysis report

Static analysis result for SHA-256 76aefe078055ec4e…

MALICIOUS

PDF

85.6 KB Created: 2021-08-09 14:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0a393f0617bf50535499c30cb244c953 SHA-1: 06dd44ef018f346cc2f9312d04c1bafe8e6ae1f5 SHA-256: 76aefe078055ec4e8b71dd3d6671f9bae1a7ec4bc2f5ef203ecd83e25a182e91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised websites or are part of a link farm designed to manipulate search engine rankings. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. The file's structure and the nature of the URLs suggest it's part of a campaign to distribute malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://partner-support.net/user_data/userfiles/files/xexulizowonurepiwi.pdf In PDF document text
    • http://thuduchouse.vn/pics/file/lobudav.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-9/20210509131905746964.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b45f890e853---21063935880.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/87364513750.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/jdjr040rr1i1irigksk47v9bj6/1664914635.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9f7d0cd1f---42555582161.pdfIn PDF document text
    • https://viettrungson.com/media//Files/94494224699.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/75282267983.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/kikonukazoxosi.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/54492c3d1ca5df866df6435b2adaa1be/12270392736.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae14f46dd14---suziwaw.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/kujoxosonewilu.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/lusorave.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/5jmrk0b3gvmmoh9nhmpn8j5235/62227014250.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082ae272faa0---18083942933.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085afab51de2---26685995515.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/tiwaruxixukemetun.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/2937727802.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160874cd00befd---pagisufa.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610a5356f1334---48951737670.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-8/20210608013157669553.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/fi8m44erp121u8okoosf9h3ol2/fugezozedetewukilukemo.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7374ce7bb---13796697017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=maths+worksheet+for+grade+4+pdfPDF 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_off0000ead5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD5 10784 bytes
SHA-256: e331b1453120d5cb78592d07fc7d7b2c49db93b780f8d452aa9973396a294962
font_01_sfnt_off000103c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD6 17248 bytes
SHA-256: 2ebfef8e29c0a3b648dda07a2d179abb20e91e84f55bcd82e1020d0aaeca117f

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