Malicious PDF — malware analysis report

Static analysis result for SHA-256 554a296893f27ea8…

MALICIOUS

PDF

86.7 KB Created: 2021-09-15 17:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 58bce8eb3fd25b99648343d5875c86e9 SHA-1: b34f536976b2faa8fe2b041308b1d23c42684cd9 SHA-256: 554a296893f27ea896abbe748fb7fe86ae22988567b59c1c3efb6e5f51f7d7f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs, many pointing to other PDF files hosted on various domains, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://qpshouse.com/upload/image/file/13130327765.pdf In PDF document text
    • https://arab-hams.com/Ups/files/63051921801.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/mupoguf.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/46100652631.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/25850434377.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/59307399373.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cab00cb7ec---xaxosowatojitajalu.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc8a2d6361---30621538630.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/26209409146.pdfIn PDF document text
    • http://24cvety.ru/upload/files/kexozugudesu.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/rizifosiregefobazitor.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161418de0d5fac---61459262013.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/38282423573.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/41997731295.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/ruxeveg.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/35512258041.pdfIn PDF document text
    • http://ave-france.com/pics/files/parabaditowokozuborijenu.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210913_220940.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/3741193483.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210905090354.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/040609311540.pdfIn PDF document text
    • http://popeyebio.com/upload/files/kivonomepowixikipukevatu.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/44847649533.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d434c932aa---vogepazidiwo.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/fedexolekumoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=watch+28+days+later+123moviesPDF link annotation
    • 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_off0000ec6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6A 17636 bytes
SHA-256: 3164b6e726807522be9108c03a2113e6d16253367970adbc457bd4697de19c6b
font_01_sfnt_off00011a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13297 11256 bytes
SHA-256: 0aba585ee5e3a6e612c579d0af4885bf5226f5ead3c947935fc8bf1fa1165336

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