Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e76760a496ea41…

MALICIOUS

PDF

99.3 KB Created: 2021-06-29 20:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a579c33caef2f6b0855ed01d519e2ec SHA-1: 815feb385b15dc7662b384733879eb465cc994fe SHA-256: a0e76760a496ea41ff26c1d2186f206aa347f5a39963da1a80a9f39ffdb767a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of multiple links pointing to potentially compromised WordPress upload directories and disposable hosting further indicates a phishing or malware distribution scheme. ClamAV detection as Pdf.Phishing.Trojan confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

Heuristics 7

  • 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.
  • 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://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/1b84f9a35c8030110742c80f6532da65/jujamapudizatezuso.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/610dd962f7714c6c9066a17101b53bd4/41860404518.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/82b260c41c7a7b06a22710bb9045397a/nisuxotigusetorofosu.pdf
    • https://pendekaremas.com/contents//files/vofalu.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078e76bf1ec7---mudewexaputojowen.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a395337cd8a0c95d48d14ac437440dad/gevuremaw.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/09b873cac312ebf372f2a19b9c85add7/liweluj.pdf
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/mogowatixanubujoxomadepif.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fe4fec690---48208737045.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee353e183---kebekawo.pdf
    • https://mn-lawfirm.com/box/userfiles/file/51392463452.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/3ri0h74ov3ft4h07navb5ta063/mugibexe.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97c4438fe---1824750730.pdf
    • http://huiking.cn/uploads/file/160808441764.pdf
    • http://steelbo.com/uploads/admins/u0/files/20210605131959.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/685f6051657ac09fae737ce88f5b86cb/92038284722.pdf
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cceea2efc3---nazul.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772325232e5---30910478559.pdf
    • http://grandrosso.com/js/upload/files/komijexoraverolene.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d687161676---75694879244.pdf
    • http://beiwendq.com/userfiles/file/todusazu.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/09ebce71e8f18738c2c8c9f9578c34ea/57483180302.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9b9e13f2a---77805900472.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=anomeric+carbon+means
    • 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
stream_003_off00012482.bin
d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12482 18328 bytes
font_00_sfnt_off0000ed0f.bin
72e6509de23dbc7ec9c5cb647c3a25f7498110fee3c7095b93246e841ab11514		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED0F 22536 bytes
font_02_sfnt_off00014223.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14223 16792 bytes
font_03_sfnt_off00015a30.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A30 3464 bytes
font_04_sfnt_off000167b0.bin
85981425dd4d1514954dcaa82571e44df138b330c74345b30e987164bbdee286		 pdf-font-stream PDF embedded font (sfnt) at offset 0x167B0 10368 bytes

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