Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e3973d20b9df952…

MALICIOUS

PDF

87.8 KB Created: 2021-07-23 07:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 13f13968149acc08d676c4650304d3d4 SHA-1: 880f9770134eb5ad25f7e5e308ee00b7ccfd8742 SHA-256: 2e3973d20b9df952edbb4f9f70ab9c766c4db4fe21c9055bb22fea1c88e27eba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/sepgsshkmhfmkphovmds7srv65/71310486592.pdf In PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcb8c0d88f---72242784101.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/lo6qi2nd1t29geopt5ojrs6af4/nodojasipinuzaboruworij.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210522205417.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/seduzopegaf.pdfIn PDF document text
    • http://bjallstar.com/upload/file/45012125304.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b2245fd4af8---lozuvu.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210710_A8E6B1596301332A.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/zasuruluvowezosazegirapex.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/72737b4bacba6386cc7a3ad59c833e2d/52874894985.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/3497643075.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c898043db49---tabakudetomosofikezij.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5f3783ebfa---22570529366.pdfIn PDF document text
    • http://rld-carbon.ru/file/sowokuxopow.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0d1100715---givobejalemixi.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/75910977878.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/bilerujawasogosezeletuj.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/106djv1040nutbkfhc9tv2h29o/zumijukeluwesuvagugeregaw.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/86253821973.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160736fbbc9fea---latogumux.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/18577176705.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160976f916db4e---54283306948.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071411163cce---46699739874.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/xizusaxiludesixato.pdfIn PDF document text
    • http://getem.eu/files/file/vavav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=mewing+before+and+afterPDF 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_off0000f392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF392 10532 bytes
SHA-256: 28562b306ad9ed57fc0a702a19be3d4ac596fb34c6bec4c40e763e1a4fa6881c
font_01_sfnt_off00010b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A4 17496 bytes
SHA-256: 126010ec540ea2402d0fe37edbc6445976282ef04a93430919cd2968ae7ca5c4