Malicious PDF — malware analysis report

Static analysis result for SHA-256 939fb2f95242724f…

MALICIOUS

PDF

99.6 KB Created: 2021-07-05 19:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c21e9d21f1370a36ad75483060b3c419 SHA-1: 2d46d3178520ccbc923a24855b0f14eabc55758b SHA-256: 939fb2f95242724ffed04f42d224dc60fe2b31c8fdff0eef5c131ff3f035aa40
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. Heuristics identify it as a link farm, with many URLs pointing to compromised CMS uploads, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9326

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 http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d23b4516340---mepibelonima.pdf
    • http://scantech3d.com/files/wosasopapurebevokiz.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093af157abc3---85611290552.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/sorewoleno.pdf
    • http://bephoangdung.vn/uploads/ckfinder/files/11954792909.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a947796e9fe---kekemokumo.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/f579e21bdd5dba363d5e2d6052e76e22/kunurunafenanaduli.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/0db1e1a428f7bf8d346b03c668f29ed5/vifagixixamolizo.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16085208a0feb3---zofisavomurorabulov.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bfdfc1626---gukabibi.pdf
    • http://amuseonline.com/absite/userfiles/file/1465140658.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/e8bc3a67e948ff79f06f25a4fd8eb2af/kemuxagamogadakuwilujeto.pdf
    • https://baobihungphu.com/media/ftp/file/magow.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf18d2e2d0---julufanigafowodibetuki.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/78f04e6d820b61de7cc0e2d077232cc0/4119913081.pdf
    • http://epmachine.ru/d/files/gekalimudopiteguzi.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/tbh8c65298crgtdk26konads3p/35792198084.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/6q5k8ql6br3oriuulutacrgap4/25918352487.pdf
    • http://wamer.org/userfiles/file/mebawi.pdf
    • https://imagebeaute.fr/userfiles/file/folawilopomawav.pdf
    • http://healthywithhart.com/res/file/43603855093.pdf
    • http://ajivikafinance.com/userfiles/file/temazivipofisare.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb793b10ef---zenim.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be9f4daa32f---waxesajaletasawekipere.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/ab2d2310edaa822fff3c13f3b742ea56/54365720004.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b68b53a2404---jejomotokutovi.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/5f587ba231f4b60a5ea6c4fdf561faad/42362170742.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=grinning+face+with+sweat+emoji
    • 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_off0000ec3b.bin
a87e15a66aafbb025344fc4e1ae68bce7dfd53f032a11737be5778c4efbe4bad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 10992 bytes
font_01_sfnt_off000105ab.bin
f7fead3b65545111ea418391920ef3f90efa32f18db07990c741662776e1d4b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105AB 19012 bytes
font_02_sfnt_off000137fc.bin
7d21276ea3b21489fe2023438d886bcaf568aa66f50c4960db83c7df99e563fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137FC 22200 bytes
font_03_sfnt_off00015c24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C24 16792 bytes
font_04_sfnt_off00017431.bin
2fa50f9501116818dcf70b672db3bede7ab34a670eda970425c5fb7c392ae490		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17431 2168 bytes

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