Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd9035ff4b538e4…

MALICIOUS

PDF

110.0 KB Created: 2021-09-04 14:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3813ed26f114303987f066d7fed6eb5 SHA-1: abfa18e357b35a93550f6e4d3656d1f4fdc1c1e7 SHA-256: 1cd9035ff4b538e4c551b5b442e2010b050c4eb5702d868c1d1a814a895c6507
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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 http://tencanpowder.com/d/files/53272201498.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d0f789e4a---magogupim.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22746159110.pdfIn PDF document text
    • https://iwistw.com/upload/files/radamedogegunilotitesu.pdfIn PDF document text
    • https://camphacement.vn/upload/files/21775049347.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/pepes.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/8306787481.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/81912251466.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36b3bbff8a---bazeguzepogoji.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/33506326812.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4b3fefb00---kajomivodilafizewojefof.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab1b83cdec---sajevikagejevutejut.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/17586675555.pdfIn PDF document text
    • http://yilip.net/userData/board/file/37688919949.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/71f1caf33dedb0250aec39a3f4631110/29907009013.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/nmqddmetad802ph3p1ur9g7ukp/79231569218.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/75178805379.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/sifawerujof.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/855f09c271b6222ab9ef1acf0ceabd17/laweti.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160708c155ef99---giguropeguxowogedade.pdfIn PDF document text
    • https://aneri12.eu/res/file/pixuxugeduxeginelajizip.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/pomomubivaxekatudagikux.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609a760321ef0---josozafegidamobupolo.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/80116117721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=importance+of+economics+in+international+relations+pdfPDF 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_off0001463b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1463B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E4D 19292 bytes
SHA-256: 2389ed59594c2f667173ae2759a4b90c4d0ee00d0d646fd88c26ff1856370748
font_02_sfnt_off0001905f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1905F 10732 bytes
SHA-256: 6a51beb1657d1a9bea3efe54a83fbea8d9ce141a59fa327f9bb78f23c685a48e