Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de88c3b82a4e582…

MALICIOUS

PDF

73.2 KB Created: 2021-09-04 09:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 911b62bb68672ba120faaa5e01dc8d1f SHA-1: e44de07b228305c2bed9af68050a5209c8442d15 SHA-256: 3de88c3b82a4e582f47156b7d889e9e755a74593281e5f1d5a3e39e22ce2de50
156 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, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL patterns strongly indicate a malicious purpose.

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://queure.ru/uplcv?utm_term=ley+de+seguridad+ciudadana+pdf PDF link annotation
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bfe6b5954---18089942541.pdfIn PDF document text
    • http://maihome.hu/admin1/file/jejonuwibotofavakowerov.pdfIn PDF document text
    • http://lg-palette.com/upload/files/19116593705.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081e60e5e7c6---95627940528.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/88005148749.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/jufolewigosasereni.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de557d791f1---mazake.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/zikajogisekuxutejosenaki.pdfIn PDF document text
    • http://sparkpro.lv/content/file/80084878748.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/1585440254.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0539ecd730---19141393064.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/benefojap.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610a842b369e3---52394356930.pdfIn PDF document text
    • http://camwater.org/media/files/vinifonesovig.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/vufesixonogojugokaru.pdfIn PDF document text
    • http://anm-av.de/uploads/files/sozukemekumunoruwamo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304abf04bbb---29755997055.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/lq2cjinsm30fb8io20kbarlmho/xepomefunure.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3006d60ee5---punifef.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/7a2173dd8378d2689f529c88c2609cf6/35826807216.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/84580554627.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f8dfedefa---lunutorofilujozedelavu.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e8cf2e646347705b7418c1c1c0f42a94/tijazirezepinemom.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/2c155f65a96c60c71c7082e79b33260a/sabedijaj.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/77636753324.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_off0000bcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB2 16756 bytes
SHA-256: 4ec4ba82e40c2ea9a53b9a7e238194ec3294f800caffff0dfa50f41397e4ff8c
font_01_sfnt_off0000e6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF6 10704 bytes
SHA-256: c9f28a98126a834ced2be78be205aeda744eb70f8fdb0957c4496735060fd9f1