Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b76026ef9141c7d…

MALICIOUS

PDF

68.9 KB Created: 2021-10-01 18:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8635fce68983ec172b37a7fb5a68b57d SHA-1: 473554ce00d92657a74daa41bc167046f2a5f5de SHA-256: 4b76026ef9141c7dc459098099c378d018daa2e350cf3863322a429c37f86eb0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing lure. It contains a single image and minimal text, typical of a screenshot designed to hide clickable links. The document includes numerous external URIs pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of multiple distinct hosts and UTM parameters further supports a phishing or scamming intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://inwebjor.ru/uplcv?utm_term=most+popular+app+on+play+store PDF link annotation
    • https://www.iimranchi.ac.in/ckfinder/uploads/userfiles/files/79583283278.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/bokexujuguza.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/38279716569.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/65882407826.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/kelezuzeluduferixapipu.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/84475166272.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ec0e93d3b---94251366225.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021961557558516.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/bebubu.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/42585858544.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/e6ef047be4bcfc9f1d27d97016d5072e/wawos.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/70473719551.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/gukipifatuluwu.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/mafosanekogeledubodezaz.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/gafoteviwosesolusexogo.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210913_CCC85D1FE4A8E7AE.pdfIn PDF document text
    • https://hklh.vip/data/attachment/file/zigafurut.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/kivolanubifi.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/35850709073.pdfIn PDF document text
    • http://electric-kernbichler.at/89087139937.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16152997c3213c---madejadoxozefomamufinuve.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d84dd9f22ea969e516dbad13f883e322/27352171103.pdfIn PDF document text
    • http://www.sunriseacademy.in/ckfinder/userfiles/files/7361946379.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/kugisizigavuf.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_off0000b287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB287 10360 bytes
SHA-256: 4d4db9c6c7546f245081615a45e4716741acabf8e05942a8af5c9238dc140bbf
font_01_sfnt_off0000ca30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE242 14244 bytes
SHA-256: 5c75929652764759a97e1e050c86e40236a9d30d8ac775f570060971aae7cadd

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