Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9686603b477081c…

MALICIOUS

PDF

291.5 KB Created: 2021-06-25 12:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3dfd19b467915b1f15e6572fe0cf301 SHA-1: 1cec1742a86638bc91f6053a2b595a8af984c19b SHA-256: f9686603b477081c643ce6e4d9f0d3bf47d5ff72b2f502e4f4c99a94a98faed6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it is a link farm pointing to compromised WordPress upload storage. The embedded URLs suggest a phishing or malware distribution attempt, likely leveraging a compromised CMS upload functionality. No scripts were extracted, but the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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.
  • 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.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958c7168b61---70317943502.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/9f45bbc1c2ca82eca37c95948285ea65/lexer.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/b2107c0d265efa2f9486301ebe0ffcc2/92613818384.pdf
    • http://kemenyseprosiklos.hu/upload/file/52553431518.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a83ae8cba---xirizaborusulokozazapi.pdf
    • http://akssert.com/userfiles/files/dulogugis.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3215dd3d9---wasekufenabiwufedibowir.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160abd41117df0---sixadolosaluvujiki.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a835dd29c56---dugixupajuxadedolisebuvu.pdf
    • http://www.abcklima.hu//data/editorfile/zajitu.pdf
    • http://sport-way.ru/img/file/31824176232.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c899abf1b8---78745675318.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/22d6898b520e556fb2cc355b4f637fdf/gomope.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086b8ad97fa0---ruvese.pdf
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/86746012017.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c3a318355---telagevebedirenonirol.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=yamaha+yz426f+manual+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003b9fd.bin
59a0c7f801b43e46bbbb5afea54388ac844cfb6d6a8e061aed050354c8f0ab40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3B9FD 1448 bytes
font_01_sfnt_off0003c1f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3C1F7 16792 bytes
font_02_sfnt_off0003da05.bin
f5d37c1a116cec565b41b1ffd769a2bdd2c4cdde9ccf60f1ffc2727110166601		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3DA05 29428 bytes
font_03_sfnt_off00042cc0.bin
78a275adb3390806c779de709aeb9d10c95189401d9c44db5461c389bb48b93c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x42CC0 23572 bytes
font_04_sfnt_off000466bc.bin
80eb8ffd725f7ee962930d6e9fb2c43afff142aa230609a4a3043093eeb25302		 pdf-font-stream PDF embedded font (sfnt) at offset 0x466BC 10676 bytes

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