Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7eb92ffe233808…

MALICIOUS

PDF

86.3 KB Created: 2021-07-05 16:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f96cd2501a1ec81d8411460277066b43 SHA-1: 39f9582a75252d86559503a2c9f25922f58d43e8 SHA-256: 4a7eb92ffe2338083a46935240d5335c15f6c63108db31c3c806d49ccee69c79
196 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and heuristics indicate it is an advance-fee scam lure. It contains numerous links to external PDFs hosted on various websites, many of which appear to be compromised or disposable. The document body is heavily obfuscated and unreadable, but the heuristics strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804c41f236d---zepiwifutavuzeranugota.pdf
    • http://brmxn.com/userfiles/file/20210514152133_7p18ih.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/840225be80fe27628bd4a4330fbb51bf/xevurodalefuwepemedo.pdf
    • https://hoangnhataudio.vn/media/files/nunigatane.pdf
    • http://moyamoya.center/images/hand_uploaded/files/23943727199.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8fca80219---77097433383.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bf4253988---pinemodevuwekavodex.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbed4604cf---gudirivil.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/bc43046dfc5aeea47932ee7401c66d65/8776893662.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c205cc0234d---76616092889.pdf
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zipopobunegituniduzilodu.pdf
    • http://www.haztartasigepszakuzlet.hu/pics/file/fiwisinoxutonasegolujar.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607f787a9952f---tosazarivatapusedo.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac68685bb3e---61995200043.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160922f709705b---12374882658.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa65a7196a---43490413293.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/7fed9c2c03d2abd3873abf266bbddb68/56658616077.pdf
    • http://banhangcongnghe.com/upload/FCK/file/regipopidejagemuxofalakal.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ca01f32b2---76189407453.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5143d465e1---99472192838.pdf
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/temozufififarorosufek.pdf
    • http://micronforgacsolo.hu/UserFiles/file/82399878573.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/4173055737.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/d06pt2ifugf0ic48sn69jd9go1/30441481932.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160adc4d643bc3---femaveridowe.pdf
    • http://optykglowacki.pl/obrazki/files/89155209574.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7ac9d094b---33696938323.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=introduction+to+utilitarianism
    • 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_off0000f064.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF064 16792 bytes
font_01_sfnt_off00010876.bin
41300b4b59ff26db279ff02f82005c9ee5fab198676b1b65c52897f6f26c5dd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10876 16816 bytes
font_02_sfnt_off000133ff.bin
0df6126b1fdb8091c4c4fea22185aa09fa242cb180cd4cbf4a3ff3fba1dd14ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133FF 10448 bytes

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