Malicious PDF — malware analysis report

Static analysis result for SHA-256 6844a75982c7e2a7…

MALICIOUS

PDF

84.4 KB Created: 2021-06-26 10:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c58d3dee274045050dc24e7735c0851 SHA-1: 271d1129cbfa3855e27808b730452e28f9809091 SHA-256: 6844a75982c7e2a7d3cfdfa7ef1a9a92dd090a25ed4f058128d2effc2dacb6ad
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded links, many pointing to compromised WordPress installations, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, but the presence of many external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=tahm+kench+tft
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afd05d8c4ff---wubopamotajebuvaxetos.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16201959287483.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/8b8b75a9be5abdc0c985bfb3f023e428/49927250474.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/8s7at62f6c683hehuf66oln4q0/jegatosuzuzokud.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe5781a2ac---tadetotizadagapopajixa.pdf
    • http://smclassof57.org/clients/34860/File/57177895052.pdf
    • http://alhouti.com/userfiles/file/vusolezam.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16094b2ecb738d---69953695876.pdf
    • https://szabobuszrendeles.hu/files/files/perenuxazokusipurelogotex.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f6b02b286---29113400808.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608410909595e---pakowerosaxolelifo.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd8d37843d---67249014100.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/e860aa17484c5faa9b9a4f0fb1638a58/nuzalekagotowuzekowate.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c184eede56---99420708490.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/267a1f3e939e7fc2ba762dcacbe70736/gurimojizora.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/eqfpebmlqqitfpf1tvpo3mm0k7/78309942817.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d5444b3dd36---wafudozozemanifu.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/4fda60b2f4ad35e993f9f62609f4ca41/jemorupina.pdf
    • https://tmtteks.com/files/61744669829.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c2.bin
523eea78a73afb3093538b4ca8277f2956a9e2b0bcc404d53e219d81d9ba3e24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C2 19552 bytes
font_01_sfnt_off0001152f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1152F 16792 bytes
font_02_sfnt_off00012d46.bin
7439c4fd4ce466bd0069d9d1e2a45f6c811fdc70e676587ed736c40d539f7b0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D46 10132 bytes

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