Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5bc74fe048bb17…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 00:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 86c5d16b53b0e34bd8a1e9b7a75ba51e SHA-1: 80a22979393078bc40e4120277cfd1242b2929d1 SHA-256: 6c5bc74fe048bb171b6d81dbbd8ecb8a3282a39a1beac4e60869c620fa5de0a2
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on disposable hosting and the use of 'utm_term' parameters suggest an attempt to game search engine results for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://e-photo.lv/ckfinder/userfiles/files/tunukewas.pdf In PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/73c01546872f67ffc4283e6cad154766/mebukamoju.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/tafasajoxenuxenaxaxokuxi.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16241034659144.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/82923525312.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/d88kte6t9hbdkkagc2e1579ita/82742951730.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/mavopogesojeg.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974ea777242---52681126651.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b884eeaba---56112584132.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/70576479791.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/75591790149.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/savidujipikotojivuz.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/t6oh5deet149arcokk26mop7op/82050284690.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/nusikadojejofa.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/132121f203f919847e3d1117f86589c5/retisokupapim.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3627d25d6c---4233479487.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/butoxapon.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/1529184374.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210705110259.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/42476647945.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/22707322776.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/93702958393.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/13979376796.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/3b0ca2647133f31f7af0a25412ca491c/83275442411.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f795bb852---90279163466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=supply+chain+management+course+outline+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e7b4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE7B4 17632 bytes
SHA-256: 28921fa25c0ccd6266af3a288c07cd3cda4ff7580b15adee30e31d827f20c370
font_00_sfnt_off0000beaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAF 16064 bytes
SHA-256: b12905aa1f5744df7e7ef103c7c7885233808c818ab029e644f6c925648a9583
font_02_sfnt_off0001023e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A55 11356 bytes
SHA-256: 39ea61af170fa20420cd90dbb620f50768b92041a3177299f27a5b298f1d4987

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