Malicious PDF — malware analysis report

Static analysis result for SHA-256 710cf513f40d2550…

MALICIOUS

PDF

85.1 KB Created: 2021-09-01 18:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1427a7dcf82fb668c888c0857a273ee5 SHA-1: 0b55fc46a8b87c18c9c9f64d3bd87f7e33820bdb SHA-256: 710cf513f40d2550ed45c8222c72f7745461165f57d1dc0c46399d155330755e
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The primary function appears to be acting as a link farm, likely to facilitate phishing attacks or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://inwebjor.ru/uplcv?utm_term=transition+words+to+connect+ideas PDF link annotation
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/14bca3537d5b0746a050d202354cb8fd/mipogepudolilo.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/eec53e7e2f15000304a98d502dee3b57/xesokeximu.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/kezatedivokorebowev.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/42091954375.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da534aea53---bonadevobis.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607e715dcaeaf---5679604791.pdfIn PDF document text
    • http://thecrayfamily.com/clients/36408/File/zanolixavoxilivuvol.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160797f5873e45---91690063013.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/kalakulukesamikigitujetu.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608222d80ea9e---segomixibutawamoridi.pdfIn PDF document text
    • http://nessium.net/userfiles/file/dinurabimuliduf.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb8cb87857---likumipamopiriv.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/25243810790.pdfIn PDF document text
    • http://ruihuitax.com/files/file/28164021854.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/2971695080.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/t82usrrd92f9jgr3usvtcn3h7a/bonok.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/19378846914.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/gizez.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088842e44762---74301234519.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/murowetozonus.pdfIn PDF document text
    • http://0048.pl/48files/file/xelojuwogatetixixa.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BC 10368 bytes
SHA-256: c39cac94ec42603c215395f7864e768047669e28c875d7de5a3960fa22c923ab
font_01_sfnt_off00010062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10062 18124 bytes
SHA-256: 98405fcc0b860b5deb50b2921004c5649f820b3daa52ec02f8a260e255d584d0
font_02_sfnt_off00012ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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