Malicious PDF — malware analysis report

Static analysis result for SHA-256 734418da6066c8d8…

MALICIOUS

PDF

82.6 KB Created: 2021-09-20 14:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eaa4fdeb39ed65cfbdbccc6dec827bcc SHA-1: a44391d4e9c93064c1d1a519a9f8bbed024977fd SHA-256: 734418da6066c8d869296e99ada24201128b7d59147e10fbca1ac4148276d9b3
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, directing users to various external websites, some hosted on compromised CMS platforms or disposable hosting. One heuristic specifically points to a raw IP address, suggesting an attempt to bypass domain reputation checks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=gta+san+andreas+full+version+apk PDF link annotation
    • http://forma8.kz/ckfinder/userfiles/files/19225504527.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/xulifonajopefo.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/68379734439.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/87e376ae8e517a4bae7c7bf2818ed949/10355703477.pdfIn PDF document text
    • http://www.ezmoving.com/file/57756559569.pdfIn PDF document text
    • https://zzhqhi.com/d/files/lofexasa.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/77731126747.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/suvivabukunekawozukepefa.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/65001457897.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/15273426495.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/gogivomugatifalujakorara.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/zekavukesujawezenoroji.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a3221e3d70944c31108da05147afc2fa/4911407806.pdfIn PDF document text
    • https://architektor.ru/uploads/file/bekukevagapaxerozofanofo.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a1429e6b55daeb8e69a4bda18f4e5e22/fowafituker.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/rurojikun.pdfPDF link annotation
    • http://msslink.ru/userfiles/files/53147094666.pdfIn PDF document text
    • http://1carl.com/userfiles/file/napukijavol.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/68900375923.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/takegivomijuzaguveme.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/fuzijorilina.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_off0000dbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE4 10788 bytes
SHA-256: d2ee4c8919c312c4ca8c65e36d861edf9e494a09b88ad22c28aa24be373fdb82
font_01_sfnt_off0000f4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E7 18812 bytes
SHA-256: 4164287db8ea8ed4b9ccd9c9aab47c2eb7ba859d3ce4ff1805c674968fa47259
font_02_sfnt_off00012572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12572 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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