Malicious PDF — malware analysis report

Static analysis result for SHA-256 415ccc50db152369…

MALICIOUS

PDF

145.5 KB Created: 2021-08-19 19:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f7597d97daf0b8487ab7e028939b4aa8 SHA-1: 38d1d128851a3a9dfa5babf6aa2d9eb1abd8cbd0 SHA-256: 415ccc50db1523695ed213859e53965c2e459161b7ee5835b34891b4ca483f86
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised websites, suggesting a phishing or SEO poisoning campaign. The document body is heavily obfuscated and appears to be non-readable content, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9719

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://vico-inmobiliaria.com/ckfinder/userfiles/files/fudikuxaselujonokudis.pdf In PDF document text
    • http://busangh.com/attfile/fckimg/file///20210811135850_1015920523.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/wibuwowadakuzomesetanam.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/fepesarepuru.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/dnkf1bqtidj150eqra34kcjqnp/84455708668.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/lagawa.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/69954371042.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/43895774e699cba34a08fa8551667976/53215408536.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/kepadufulokujej.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/252tlabd4ktco3r04e0g4aubot/1518363802.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/kefanedepikowumajatuv.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/135120d2cf883e33c020b2ebbe510d93/lugawijuzuvat.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210616081744_2125321001.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/e2ff262527bf58abddf8ef4ca8ef539f/tivoxizusofesokudokaze.pdfIn PDF document text
    • https://blokhol.com/upload/files/54451518304.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/watono.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/sobetanasasanoguzatazoja.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607731770240e---79137686182.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/punalopiguxidud.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/gao1q3veu2ktc4095c0d9rrhdp/92210883931.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988548afb19---toxogimiwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=harry+potter+and+the+philosopher%27s+stone+summary+full+movie+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001f305.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1F305 18176 bytes
SHA-256: af4c60e238f1705891d7bf779f3e325ee06e36746a4487e295b4d58167921cb5
font_00_sfnt_off00019b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B352 25716 bytes
SHA-256: f71aa558cab0adba78d52a5be01fdb70b862dd915f1bc8382b4cd20c0eef4282
font_03_sfnt_off00020f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20F9F 3196 bytes
SHA-256: bfce72472d0660e52fac7a1037748d4b20d1c7b3b7238d91512caf97d57a5889
font_04_sfnt_off00021c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21C83 11156 bytes
SHA-256: b12939183b58de347fca2b432a762170d77d1e4c250c0075ca3be6ac3d9458d0

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