Malicious PDF — malware analysis report

Static analysis result for SHA-256 a319c05f68d80741…

MALICIOUS

PDF

96.1 KB Created: 2021-07-20 20:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3068fe8884a0eefcd34970b362dfb462 SHA-1: 8ba643d5f41b714e7c45e206c9fe94e7cfc3ba20 SHA-256: a319c05f68d80741323044f9121939d38cb4f4fa14b5bf68f00ac0655730e420
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely facilitates the redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://condominiobrisasdelnorte.com/userfiles/file/kakemebotaluvela.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c35f10854a0---fozexekoli.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/1mipg68rlit2agn5di5j808fm4/77338386304.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/39866827216.pdf
    • https://konferencii.ru/js/ckfinder/userfiles/files/2431096485.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e28bcb26c---fetebolawokewuzon.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/d8eb3cf38a7c2a19349f5af9441c47b6/kitevedamomojuw.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c98a0ca4131---robowumu.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/vkfniib11q7m1etkefe7i05snj/31381690217.pdf
    • https://anfauglir.com/images/file/nozobuzixareluk.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5701abf1b---91897091484.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/ee854afb72eaa5ca93b871e06dd3d54b/zofoxitigunamo.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da367ec8f58---xamanipokoj.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/b807b13453a821a7eff16ad4001e10a2/59907721492.pdf
    • http://hayatteknoloji.com/webimage/file/bipeg.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/a1ff129f7792727ccc4afa4b8244e2d8/35157503837.pdf
    • https://alamansyria.com/userfiles/file/16746440915.pdf
    • http://varanini.pl/userfiles/file/mukomavaseruvituwosugeri.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/0414e2daf514c65b9e3d0ebf91fa0a0d/gidafadonakami.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c959eea73---19654659715.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c708ebb0fa---mifedig.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ec5c81d9---69729680029.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/4q8bvoi16f4ftu695jh7hnb2ug/kaladibigudejatisebovelo.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073d8edeec61---23200684763.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5a934d0344---tefavinixef.pdf
    • http://fratellilongoni.com/userfiles/files/76204483174.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/450dc4963079258ae19e47dbf39bc065/57056565085.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/knlhkqd3lonthn1kklm6pivks1/sozevafomu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=top+expensive+cities+in+the+world
    • 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_off000114d8.bin
94c1b80b4a91123618dbad6922a56bf6f9ca0ce55e637d57a51fdfe68f61c4b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114D8 10668 bytes
font_01_sfnt_off00012d4c.bin
ac24264b267186f3ca0993b53e8fac5d69147dd05acb71d2dcd9352e98cc28e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4C 17328 bytes
font_02_sfnt_off00015ace.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15ACE 16792 bytes

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