Malicious PDF — malware analysis report

Static analysis result for SHA-256 15153f2f6372586d…

MALICIOUS

PDF

79.1 KB Created: 2021-09-08 18:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 65cc5e0a0c771e5dcf369df2a47f1d27 SHA-1: bc719d0305c7c716a089fa6a78be304bf0b612af SHA-256: 15153f2f6372586d0220713949e9606797332b2ff6852b2a886494ac22acedda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pistant.ru/uplcv?utm_term=konstipasi+pada+ibu+hamil+trimester+3+pdf PDF link annotation
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/silelarujagup.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/60131759179.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332233b10f3---93992933284.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/ketutoruduraravomelix.pdfIn PDF document text
    • https://partetesal.ir/data/file/ninodejuzixasa.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/128698fd46ede4914b1b23d221fe3e3e/45502632737.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/39f31ae31a1e695890d9972d6cb5d699/wosekore.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/malibilosixemubedugavig.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/kofiparexisabojatom.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161386aaa1ab57---48377989233.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/nubotetelofibozaman.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/wigetumamijovomoxitizuv.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/sakejuxapidomexevifajizek.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/73412364030.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/lojimalokakudivadaseli.pdfIn PDF document text
    • http://annabarons.lv/files/files/dovoveneremamunum.pdfIn PDF document text
    • http://juncheng.tw/upload/files/82230692120.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/80237455904.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/44441036653.pdfIn PDF document text
    • http://seritour.com/rsm/files/54480207197.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/22701445010.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/rodolefotufovezovojow.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/32372175991.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_off0000d403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD403 11168 bytes
SHA-256: c61d3c84071d6d49ea415e789ea85ddc57de3c87369f7b38b8fb814861a08a67
font_01_sfnt_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C9 15804 bytes
SHA-256: 66eb97cd7cf3641620ce611fdcb8645103a4702f8d73fe86771effbaa55fa4e2

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