Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1944069bfb453ab…

MALICIOUS

PDF

77.7 KB Created: 2021-09-17 21:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f47403d236bedd113973f47225465c18 SHA-1: 2d42d143a79b80e778a67305474a6e326c2e61e3 SHA-256: f1944069bfb453abfc46ec85e49dae3e95dd1bf4bd6a7c3c281c466d7f71fc00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it may leverage embedded JavaScript or exploit vulnerabilities to achieve its malicious goals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://chcial.ru/uplcv?utm_term=level+up+apk PDF link annotation
    • http://membranekeyboard.pl/_data/file/84182583610.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb2c697b59---88337218163.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/82194541727.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/gadevifeguluzefexefun.pdfIn PDF document text
    • https://signika.pl/Upload/file/31774002234.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/85994609736.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/46891843875.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210909091454.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/66008428438.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/xozifasetomuwibiduwi.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/83239086624.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/mosirapabisonemerab.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414ccd2b627---36382549857.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/wunuvotutizarexuxexujimat.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/sakisa.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/sovubaxalik.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342796dfeb2---10301433734.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210911132328.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/gojarajibixovamu.pdfIn PDF document text
    • http://corkpotters.com/images/3329325281.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/72890792795.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/xinasiribiwu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000fac8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFAC8 16452 bytes
SHA-256: e203dcd6b8d5225eb3647be05e3033377d4d1c40291cbc923550bd501d5f1a56
font_00_sfnt_off0000b445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB445 19964 bytes
SHA-256: 87e0d46fa3a7b459b1ff09129a74346da89b3b706565747a71ad7e920316ed92
font_01_sfnt_off0000e547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE547 9780 bytes
SHA-256: a1c412ea3e176e020c31a3b48c4bd699d1145d5692049ccd144acb8125ea71cf
font_03_sfnt_off0001117d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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