Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f01dc607b1ef80a…

MALICIOUS

PDF

85.8 KB Created: 2021-08-12 09:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c47630fec5ec7247119e402625aa88e8 SHA-1: 17458ef99eb09523d180cfad8ee01a9117bedfd2 SHA-256: 3f01dc607b1ef80aa047b0bd1721a1b10beb2cbeb48d7c90272293cf370f7a24
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, which are likely used to host phishing pages or distribute further malware. The presence of multiple distinct hosts and the use of UTM parameters in some URLs suggest a coordinated effort to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/71loer0u00ir5ip4t7a8dmnf92/merorowurusizokolijuj.pdf In PDF document text
    • https://gyn-koe70.de/obrazky/file/fafojakamagetufulop.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/20649206192.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5533bb6cb0---13697916062.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/meqjd1m77u3u9u8s6j2b0j5ecr/wejejimolobofesozasipo.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/sl911s63bloggp7rn5f4cpklnr/kabakowetezewonomaz.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a69ea090338---35485752288.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/lapidesozudanosesomegemu.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/pekijoposos.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e6aca6d1240---57758673669.pdfIn PDF document text
    • https://aaaxxion.info/images/file/16534799571.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b70eab610---7470726047.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/veretosifole.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/33290473182.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/56e79167270586509c0411bbfb3df428/nofexisogotux.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/kugameguzadibimirefabi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5a6b8f9d6---3406978478.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/g826hls1pact7csolo17s5njc0/desokamanixisixolugajaxo.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/10179636191.pdfIn PDF document text
    • https://cheesykeju.com/contents//files/mugudebifaf.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/mujaga.pdfIn PDF document text
    • http://weingut-suppan.at/files/21035605034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=aha+acls+exam+answers+2020PDF 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_off0000ecfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFC 16952 bytes
SHA-256: 39237789390fbe132677b08660bcf5b7f27a6c160814cb722a2289895c096f55
font_01_sfnt_off00011901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11901 10596 bytes
SHA-256: 1834bd3800d8268dfc9669ce4510a8d0cdcedc2d88371878d312594f998e4d03
font_02_sfnt_off00013136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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