Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f28cd19fab2257c…

MALICIOUS

PDF

70.1 KB Created: 2021-09-29 00:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2a8749b7713a5039c7e65b969f9a291d SHA-1: e9f86fd7efd1efc917b4bdba23f5f934545c39c0 SHA-256: 7f28cd19fab2257c4eec16003ca8d3f5ce514f676f08f63867f5c00f409e7b17
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The embedded URLs point to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted, but the PDF structure and URL patterns strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=my+name+is+khan+putlocker PDF link annotation
    • https://sharmtocairo.com/userfiles/files/12147331554.pdfIn PDF document text
    • http://anton-joyeros.shopcloud.es/ckfinder/userfiles/files/77252725531.pdfIn PDF document text
    • https://citytrafik.nu/images/file/jikaxabate.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613523850e8ba---zuzizetebibaruforuzupa.pdfIn PDF document text
    • http://chikatere.com/Upload/files/78534411818.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/52467872663.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/lubogufo.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/tegokalojimomofukogavaw.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/wudemumun.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d2d8397f28b2aeb14a8b445008871431/94330771815.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/42903979729.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147fc6e84503---jefumekuxivokujege.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/bawofetilajujevosuf.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/68303710585.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613325f0c4d3a---30800805997.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/37097683779.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/jorobexe.pdfIn PDF document text
    • http://standardamulet.com/files/files/xakeraroxuridufipegat.pdfIn PDF document text
    • http://15881588.com/ckupload/files/dogijurejubonagusajor.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/99945817692.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/mupetonadelixaxa.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/reketijevitofegudu.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109032056143947.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_off0000aff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC808 10936 bytes
SHA-256: f686f4f9599d28d48330a3eab5c9870fa730195d1a6b97f74bf3f99c80f97432
font_02_sfnt_off0000e132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE132 16472 bytes
SHA-256: 90eef4c36e9957be63d9ddfcb40098b35752c02f64205b169b32350bc28d7f24

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