Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ff48a7ea7106d3…

MALICIOUS

PDF

119.1 KB Created: 2021-07-03 10:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 201397e355094d97d6bc77ee1ea55488 SHA-1: f265591ca24ac70b70a442a5497fcbc10a1a7ad9 SHA-256: 05ff48a7ea7106d36369ad1891f177e7eb6ede441b3946e404a2f67faca65308
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for further exploitation or phishing. The presence of a link farm on disposable hosting suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/106020b037bd92351db61475813595d9/70406239653.pdf In PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088a018221d0---pekarexiwidonatumolasitu.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/0f936a43d2dc2078fa9d315b662c3d00/49112851611.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/3caa6340544e4b966e994b81732552b7/88060739960.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/5066908457.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160724eb2db3b4---74537399897.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608427684bdde---lesoxawigizogulegifizubu.pdfIn PDF document text
    • http://savannahcentury.info/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/pukuxewigizovobowix.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/66135341755.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/7ou9ikei1qs0doc6dbvin8nhsu/mudun.pdfIn PDF document text
    • http://thedreams.cz/files/rakepovolavobararotekij.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/a9dfa3f1fd5569001bf0306239474606/norakuxo.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/e275d7c7ea69f942559d3c4758109cc2/13322779932.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fffe17ac9---rusonalapupozufu.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/94275889779.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8e46b5101---30418088040.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608343ffab5c6---80298951739.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ac2881121---gosumorokagufijumido.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/16bb8648483cf847e8a50a44a69e8b60/15580167374.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736b4029e09---84664800492.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/81920013781.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/531a88ac3a5f9672082075e87aabd544/73503314549.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/lubuditewinu.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/74222315139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=holy+thursday+meaningPDF 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
font_00_sfnt_off00013ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFB 17240 bytes
SHA-256: 726b039183f22460c476548521101804cc02f8b7e6ebcc99271cba419df5756b
font_01_sfnt_off00015932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15932 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17149 10900 bytes
SHA-256: 075aaa7f07cfddefb8bf315af72444fbb3b444f1faeeb9e790c75d40b7e11cf1
font_03_sfnt_off00018a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A1C 22332 bytes
SHA-256: 380e9d5c367f0861f561c77a40be23e63fa121d9e1cc38cdf84c1a81f0d5d6a0
font_04_sfnt_off0001c17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C17D 2756 bytes
SHA-256: e090432f91fb9f760e413c327c1e39df75a61407a974e48b71ccbd92708f4479

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