Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb72427237c9bf5…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 12:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c87b7b30178e763f79f18dfcceec9386 SHA-1: 566b82ef0562013eb236b35b8435068301223bcf SHA-256: ecb72427237c9bf5f2f8ed6d42818bdf658b4d9ed0758cdbab56616a85a0dce0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic firings indicate that the PDF is structured as a link farm on disposable hosting, with some links pointing to compromised WordPress upload storage. No scripts were extracted from this sample, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://cructi.ru/uplcv?utm_term=letter+of+completion PDF link annotation
    • http://pastoret.it/userfiles/files/64628713441.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/16991148654.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324f38a40aa---segom.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/setogadafulodobiwevijuw.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/31058254458.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/29465356605.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/jodikinagevalabunokifeda.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/koxolekiselaxinuxef.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/banamawefixolufen.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413177f1041---mibedawufoditipuponer.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/fimabadokajadasezagum.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161408e54f37a0---70568249186.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/varegotenudifo.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/vibudorerupitubu.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/81130783437.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/80503269850.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca809d88a7---judodapapeko.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109091021243706.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6575b4858---55948380294.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141811dd07f3---dajubesugozotosu.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/33558191163.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/nogiluxesik.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210910_A94C8F478D12FFBB.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c1fc48234561adb0f874b66485a06f7d/12187239915.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_off0000da6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6B 10268 bytes
SHA-256: ef98b3f4a5493226de61302de6fe30200a59a718b41e26e8cc16b4d839764f58
font_01_sfnt_off0000f169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF169 17304 bytes
SHA-256: f8e417341e34b0eb5949eedd846f7ef8337a5a20d94d5599fae7ed866aaf9989
font_02_sfnt_off00011e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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