Malicious PDF — malware analysis report

Static analysis result for SHA-256 7510a6dbfcdb94f5…

MALICIOUS

PDF

85.9 KB Created: 2021-06-26 06:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b8a18f6f15316599db42617ead57c1be SHA-1: 9c85fb3645fc9f333c411c1cc2f965ca7bb585d8 SHA-256: 7510a6dbfcdb94f5667f787d447ee9eb23d868161abbc47fcbcdd91f9698b9e2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable hosting, indicating a strong intent to redirect users to malicious content. The presence of these links suggests the primary purpose is to facilitate phishing attacks or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://philabc.ru/uplcv?utm_term=can+you+reheat+chinese+food PDF link annotation
    • http://hurtmar.pl/Upload/file/65681417406.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/rejunufulatinoro.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/pr80hue3sieubohkbdvapsut3d/kakuvepixepibudaja.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/c7d25e4f3c812148d432698a8c9d897a/74325162253.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/767b56a0399db1377dd42e4b1df49e95/gubejokatanopin.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c4d82e686---tuvunilo.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/85025798545.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160852735a2547---13109626933.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/7ad7c84fbe11fececf6b0534f150893e/zukese.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/83f7560a27c526e9df9f27f750e2c158/61647116804.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea6a963cc9---97766212154.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/15169db9c76fed8924a8abd8473bf2b0/64248698266.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/bofalen.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/udusia5qinoalu743s05oq35q4/tidapu.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdfefb5e3f---55346890977.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/dad42fed78798f06c23ccf105a25ecf8/25330801124.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9836e51eec---95388396657.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/dogudajekeri.pdfIn PDF document text
    • http://surtek.biz/image/files/20150128_123943.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/367d54e397a36ce67a91e5bdeea530c1/funarafipavaninowuxuzi.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/62770757480.pdfIn PDF document text
    • https://motacademy.it/file/32293897736.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b203eae2a15---86358655807.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d68d09f961---66562047606.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFA 17336 bytes
SHA-256: fc628368ef6ab7defa821f3eaf695043f5d7e17cc2607f0821db44a9fc3292ff
font_01_sfnt_off000117c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C3 10772 bytes
SHA-256: b4721b44c044beb413441d0b2cac524352e08b98a32dc9f25a8ccc6adf3c3368
font_02_sfnt_off00013097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13097 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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