Malicious PDF — malware analysis report

Static analysis result for SHA-256 98cc047813150739…

MALICIOUS

PDF

91.7 KB Created: 2021-07-29 14:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e43d8acae43a9789a5a2cece0c331f0 SHA-1: 66cd32573e716b688393a6af3e1573e677275758 SHA-256: 98cc047813150739036aecee43ea27787f08b2e622410a2057c240d62e4b4835
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or other potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wasserburg.pl/userfiles/file/moxapedukoma.pdf In PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/3f73066d9b5641c8da7fc492bf2c1936/tipumekivujegol.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/36333424867.pdfIn PDF document text
    • http://lblussana.it/images/file/97473269124.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/74240233483.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094be39c4d44---59135995586.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/tiluxigobuxujamux.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ollhdauno38a6gdcocnf3g41vk/dijidejiluxorisofijoza.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2a254c85e---sefuzunepi.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160704f6aa53a7---zuvuxejedexevezemo.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210727_15F9D362723F3B8B.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/25361032219.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/daletilawodixosiwivos.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608769d9b54ec---wobasuxofu.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608560639e90e---bafewadewabamig.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/ue9oaosl7slp4hh5cbg11vvq76/89948631375.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaffa9545d---xamanemudesapuzoxe.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/060843235927.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/tizobuwanuzagarujojujot.pdfIn PDF document text
    • http://ramsteinroyals.com/clients/e/e6/e68fa2bc61b75b8a06766e25905052c7/File/kitovaku.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/mosekanati.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/0d967925b1740f716ea033230ba63a54/21051200282.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908275dc6e3---pubilamul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=bose+soundlink+mini+mit+windows+10+verbindenPDF 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_off0000fc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC84 10960 bytes
SHA-256: 0795264e88841eb7561c8664c7fe677d46396305f0032b89cccc03a7eeae7e28
font_01_sfnt_off00011603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11603 19280 bytes
SHA-256: 13973b4cb84a066822849696e522dd2daee49d878abdf4e7b2539d9a808d6be2
font_02_sfnt_off00014820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14820 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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