Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d1b506b87682587…

MALICIOUS

PDF

71.9 KB Created: 2021-09-17 07:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 27546c0a6b763dcf630c3547e94e0a8b SHA-1: 3f17f61ddbf32da42c825cb88beb1b818a1fc2dc SHA-256: 2d1b506b876825874538ad0229d4ee2f07648fd88554d093c5846f6f4e855716
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7062

Heuristics 5

  • 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
  • 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://archism.ru/uplcv?utm_term=snaptube+apk+latest+download PDF link annotation
    • https://ojazzdance.fr/userfiles/file/dixaxipeloxefalenojizabo.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/c19f475c06a69db9bff0502ec140513d/tugajobaxokubifugepidavak.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/0l35urabc0iiladi7eit117djo/punokinutepi.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddf4f419e1---pesuranerijanebazi.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e8a9db7d7---wunafuvunude.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/8315583687.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/85956148805.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/kasazozapakemajixewe.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/neroponeja.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/453c1a0250f945798ffb5d8e184afdbc/dujowafaxunigogirati.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/lafuzojab.pdfIn PDF document text
    • http://villaroyalenews.com/userimages/84860945888.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/sedavabi.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210902_053625.pdfIn PDF document text
    • https://tempegaring.com/contents/files/mulonulaxidexat.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/xedawefofu.pdfIn PDF document text
    • http://glttek.com/userfiles/file/gosafupixelak.pdfIn PDF document text
    • https://felixtrail.com/imagini_ws/45256836213.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210917_122358_4863.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-07/210907001743079539pbbvrrkpowns.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142268151db7---41024026803.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a3e303aeb827f77e43cd04d27ed43804/66254819199.pdfIn PDF document text
    • 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_off0000d41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41E 17796 bytes
SHA-256: aa792af03066c0459d72622a49f3ee6eb4104f4e61619e9e401f4f8009400124
font_01_sfnt_off00010212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10212 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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