Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f0f4cd6529f7ea…

MALICIOUS

PDF

101.8 KB Created: 2021-09-16 01:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 22c2bf76e5e019ffe6de541160429dc8 SHA-1: ea028b38eb7a81188d64efd81ff9233f1696c1ad SHA-256: 27f0f4cd6529f7eaec30b5b984de82bdb328ec3544fa198ea91b80cd5c48cb05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically related to phishing and link farming. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to create a link farm for malicious purposes. No scripts were extracted, but the structure and embedded URLs strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=top+10+most+populous+country PDF link annotation
    • http://hotel-ambassador-nice.com/upload/files/32612556591.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c43409ccd---nigipawogowisiwofisev.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/20741665170.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/mutifipamejimar.pdfIn PDF document text
    • https://ka-base.no/images_students/files/bevefilisemod.pdfIn PDF document text
    • http://ranchobg.com/img/file/53091703890.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/kasijajoregazafuwo.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/mogawuwawuzijenedot.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/59845779442.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/fofetuwovipegilelif.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/taberon.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/lasopajederifupugok.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/21778962236.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161421ff7b31b7---50292007376.pdfIn PDF document text
    • https://termofriz.rs/files/77924718927.pdfIn PDF document text
    • http://sns.hu/_user/file/13697710243.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/6282031055.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/23597720460.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/sozasosipulizobazoge.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16138d878eabc7---54699605484.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/mupaxatodewolivofam.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/nelonunumiviv.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_off00012234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12234 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A46 21008 bytes
SHA-256: 38990bae7a6fbc3a58b3eb759948560f8d7852d05929c09b04288de298555814
font_02_sfnt_off000171ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171AC 10500 bytes
SHA-256: 7a5bdf639a8fb2e43bcc00362f483737d9414138bcf3fe3dd4531ea0b5c013c7