Malicious PDF — malware analysis report

Static analysis result for SHA-256 091182264e13dfee…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 05:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6b045dc4ca55e52f45cd7a8389b08045 SHA-1: a12f3d340e0c76ce90e97a635a3c7bde0631ea0e SHA-256: 091182264e13dfee5bb9d1cf3efb0706d96f25a0229abd921aa5c691ae68dbf5
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to various websites. Several of these URLs lead to compromised CMS upload storage, indicating a potential distribution point for malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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 http://cupta.org/userfiles/files/20210911192905.pdf In PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf92a838dc---modevubujozebul.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/23604786452.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/mukanevogapukotinejapuwe.pdfIn PDF document text
    • http://whatdwellswithin.com/file/3757396174.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/lejudogejomitimojaretapum.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/f8se98pbs4h1p1qbt2upprtmu1/segojawavo.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/dopupiruwusavagogasafo.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/rerivanexorare.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/kisuvitamowubikinerujok.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/kagixifuk.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/2251205706.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/80455154606.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/gdmp80995ltv3dc5gfffb243s4/95713035256.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/40462025401.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/didilegoduvozufisofovimu.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/31900650982.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/81345365700.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/20908305178.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/zigopefixenutiraka.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/23221338283.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/gabavosaves.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/10075757916.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/12425928377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=fear+the+walking+dead+season+6+episode+2+fullPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 18700 bytes
SHA-256: 41442bb7508c3a7b8cf039df5133c3d0f16ef85e492117142e6393c608fda8f9
font_01_sfnt_off00011dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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