Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcc2ade86551c8cb…

MALICIOUS

PDF

94.7 KB Created: 2021-09-13 00:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 37534de2b19cd90ba6488de32f8065d1 SHA-1: 36361a2dce2c7486ea9e4d0de4cf2f7602faaaac SHA-256: fcc2ade86551c8cb061ea6f3c33cd6efb17797f18fc442cfb78a64d9c5f58a9e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO poisoning, by directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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://pistant.ru/uplcv?utm_term=box+simulator+for+brawl+stars+cool+boxes+apk PDF link annotation
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/65781996228.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/vuturirapebuza.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/paniruvofu.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/34098000005.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/roromuzulikivufumavu.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/zusalukupe.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/22232125901.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/kasinokemog.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/mufipe.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/7390723275.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/c86c7bed690fb94421bdcbea774d0b01/tipoxixojizudira.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/jugajibuger.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed4dd02b81---15761540644.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/a8499ae46cb5e57281c03450ce17b983/voruf.pdfIn PDF document text
    • https://fishboat.hr/files/gigolow.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/64009225841.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/mapijividubekudoduluw.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/15626695468.pdfIn PDF document text
    • https://argumentua.com/i/file/kowafog.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/bigopumuvuvorifujowoka.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/jurubelosim.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/sivozomu.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/84731064352.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/66211056595.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9C 16496 bytes
SHA-256: 330de6f67418e614f5505aff37db8be55020b7bf2d3a45f0e51b10319d8c5fb5
font_01_sfnt_off0000f1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B6 11112 bytes
SHA-256: 570896778363fa2379d56eb2884cff5bcd59ede674593b06a35c006b93c16bce
font_02_sfnt_off00010b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9B 24932 bytes
SHA-256: db4fd5c572ffab2041b9e4d1f6e2863e7d6a76cb668b97c5c2a3d6fc3a000471
font_03_sfnt_off000148ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000160db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160DB 1944 bytes
SHA-256: fa92da40c41afd9c99f315dfd19457d546f7e0bd2f48e5353a27017d53b2d8af

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