Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f0ced85230a7c7…

MALICIOUS

PDF

74.5 KB Created: 2021-08-17 19:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 02eb114e9d01aae11e0824cfa8ca4406 SHA-1: 21fd0bde71ec9e3432c8e1164d96992bdf79ed2b SHA-256: e1f0ced85230a7c7a29632e40d6a5153a53fd4aeecb48f64f23218f1ca260789
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites utilizing the formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc9e335058---80615723537.pdf In PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160803c9e9b8e7---gamevuwafoxoj.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/jruk2nb0u17a88r4huts9lu2c8/ravesetobukor.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/belip.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/ifshdbtuouf3jqhn0sqrc1ljfm/guzomipibakalepuvifimi.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/wupirugugijawotebu.pdfIn PDF document text
    • https://jagamimpi.net/contents//files/11872664861.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/pifatep.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/62468479248.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210731_c3e49.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/711e9ffc609d0d8ac64663cbb834e648/pewitekinumipadavimalo.pdfIn PDF document text
    • http://fotossc.pl/_files/file/jinorarodilixubezugofad.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/durokirotazuf.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b652312152d---2289670272.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/jixotofid.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/silejunufezipinazede.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/12365938217.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a92e6913ba---26026542639.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/95120437469.pdfIn PDF document text
    • http://modern-pro.ru/files/file/mufedifelej.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a31dac56c5---90419756024.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/ecda62cf507573793125e0cadda58106/27649183456.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/cd81648a7da1f4fd47d8551eff4953c2/judumidaliniguzijo.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/78568267770.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/patudewugonovofejanuvid.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/nutowon.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/37299973176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=libro+de+matematicas+tercer+grado+telesecundaria+para+el+maestroPDF 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_off0000c0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E8 16244 bytes
SHA-256: 16d30df15d25c6f6f9f32d8dfb9a8fdba4ddc7b3b8f9638a1c07671786d4bcd8
font_01_sfnt_off0000ea2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2A 11052 bytes
SHA-256: 2d28a16cbb93af58f88d76222c765b5e86e30066552133675dfecd2d7ec50297
font_02_sfnt_off00010377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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