Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc503094b3c2ee88…

MALICIOUS

PDF

88.6 KB Created: 2021-09-03 18:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6331434eb8fea08d47007603f41dcaed SHA-1: 18bc84233b39a80b1bee2ee5fde1971983f45c8b SHA-256: bc503094b3c2ee8843f65c168aa8834ee5fff866e283438ecf149f5a0c3fd1f7
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 identified it as a link farm on disposable hosting, with multiple URLs pointing to compromised CMS uploads and potentially malicious PDFs. The presence of numerous unknown reputation URLs further supports the phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://hagelkonzept.de/userfiles/file/lomakoguvolomarawa.pdf In PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/petofetajuwexarewad.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811c80f201a---72515559567.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/99888503290.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/8660332968.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/bokeginaweka.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/xunimi.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794eb56c88c---bebobujoxozinopojuzinane.pdfIn PDF document text
    • http://iccarrentals.com/files/file/tedutep.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/65351987973.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758d48f1292---naxaronivo.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/xajenoviro.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/45676986253.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/fulibetofozeneve.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/88607996563.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b35e746698---fotawefuva.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210723101732_o7z5za.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/17194884113.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/18rujfl6u288m74s9j6uf6n80j/sibemajoboti.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/49520630678.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/fc11e015aa4a44e43d4e62f69840b48b/xabefunepafuja.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b360653c613---fufatuwirusaxotukafakeve.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809a80cfead---82661521473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=expansion+y+contraccion+de+ideas+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_off0000ed3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10551 10764 bytes
SHA-256: ea2408e7aa44a5768e3b8e89bbf3cc40b0050aeaa4d30f6dde13ed7cf1bd3ce3
font_02_sfnt_off00011e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4D 21768 bytes
SHA-256: 37817b8291c6449dd71c50a07449ed72a408df56f05c06d7c27947d77da6be9e

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