Malicious PDF — malware analysis report

Static analysis result for SHA-256 d392e56021ef949f…

MALICIOUS

PDF

75.3 KB Created: 2021-09-02 10:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c59225e9e509155ff60bb960c3ae0c5 SHA-1: a19b28fde409aa63d01974eeee0345e1213052f9 SHA-256: d392e56021ef949f140df4a4b3f70c58a3ba7f5c4265e63d7b18e720cdb0fc97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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
  • 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://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608986aa85bb0---mifafuvasokokawukuroned.pdf In PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/xaposonusezovekaja.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/1867dab3d992faf024c09f9e4b3e28d5/98133398339.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/mubipazifenovebera.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/da4cf9839820234cf11d9f75e35c7acc/1942685396.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810cfaa88ab---72147880294.pdfIn PDF document text
    • http://goref.ru/files/file/37030405884.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/nojokisawog.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/4sb68dravanmsobfbaq29vguot/7787613671.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2c09d85a7---vuxegodexapajuj.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/tokepelira.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210729203132.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/vugubafoletisa.pdfIn PDF document text
    • https://ebdaatcoop.com/userfiles/files/47424423613.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/10294797471.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/tirepevomifujuwew.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/58857677195.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/pukapusakesadifujotazil.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55bf22f67e---kilerilumuvin.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/73457216323.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d51154953---didakanenala.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/rateropomojelameg.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/73123372543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=asl+timber+story+answersPDF link annotation
    • 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_off0000c5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E9 15908 bytes
SHA-256: db635699a3ceeadfad1da7c0b56299c637e64e04edd914913577e664fe57b6af
font_01_sfnt_off0000ee3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 10592 bytes
SHA-256: e0c9939c054e27404832d7598665f636ec6b248aec4126c9748b793914d62ef4
font_02_sfnt_off0001067d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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