Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bff1e24ddf6d150…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 10:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a8c83a0331dd4c05ef01851fc11e1078 SHA-1: 544ea59717f075110fe194014ffd8ec58cf1946e SHA-256: 3bff1e24ddf6d1504def5c0691e2723e238e5ff70345ea381c5aa7e51f221370
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also includes numerous external URIs pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://queure.ru/uplcv?utm_term=java+complete+reference+10th+edition+pdf PDF link annotation
    • https://ehotelgateway.com/bot/ckfinder/uf/files/barivasulonifunaxosoxinu.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/44302032814.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/fopitarojos.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/farirazomizorobugike.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa787cdca4---zenoludomidokomudaxefimu.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b5aeedf29---31953448679.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/timaf.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/zaboni.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/difejate.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/78926190021.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161364a3e3c65a---zozapipezagibagon.pdfIn PDF document text
    • http://sakem.org/userfiles/files/60983296652.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/nojowupidawa.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/sigirekorojugepu.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6be800c46---zezusulavemekanovix.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/luvobakovosis.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/71128660240.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/11381584045.pdfIn PDF document text
    • https://ms02bet.com/contents/files/vifonigijuga.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/45966617721.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/tufiku.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e736f43eca---5114830029.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/23124649068.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/31270574880.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210909102943_YmlzZWR1Zm9tYWxldGVkb21vdGFqZXM=.pdfIn PDF document text
    • 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_off0000d65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65F 10948 bytes
SHA-256: 975aa393bbf4bb935ba692e3e2437526f0106ec0c6a907955a184e9b88c8d2f8
font_01_sfnt_off0000ef96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A8 17896 bytes
SHA-256: 7d3f43a3db6f0ea740b4bacaf7e802f04ab23e3869ed1c715e85a3a93da59bf1

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