Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1b1c09ef21aaab…

MALICIOUS

PDF

82.1 KB Created: 2021-07-10 05:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: af828315a2e4319d841ccbef327fdabe SHA-1: a88161b4e6b807efb006e381a9b9054217515191 SHA-256: bc1b1c09ef21aaab35de833c614223e1689eaa6b089c40997747f0445fefece8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tlumacz-lipno.pl/pdrzewiecki/files/78817234411.pdf In PDF document text
    • https://cmsschoolkg.org/userfiles/file/gakuli.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/47989250924.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/ac299985571b0cf128f32b90902f3190/xazewexoxipu.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/jiradolija.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/xotexigan.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/xiwumewupidu.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/62897720574.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/17558078245.pdfIn PDF document text
    • http://accronline.com/userfiles/file/88560061798.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/84826525849.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160747d581e2bd---puzajiwofojanaladigib.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/kilufi.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/55544408168.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/89482865428.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/dewerozagiwogila.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609820acadf5e---66515932050.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/2769822399.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d8352f2533c---22345552297.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e834b73b27e---zumivewajerivovazada.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/46d38016b88ecda9e4d95a81cbcf5e3b/dugapidavixidanodek.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b41bbb7642c---33864593910.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/67055394769.pdfIn PDF document text
    • http://centrostudiapulia.it/files/files/kimefukozumilixo.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a57a78851c5---xegoxapulaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ashfield+health+and+wellbeing+centrePDF 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_off0000dfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDF 10844 bytes
SHA-256: 7b1b13ef9810a1352adb26827d4541130e01ffee0fbcbd382719922542f84219
font_01_sfnt_off0000f8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C7 16392 bytes
SHA-256: e674ae310205d474cfee341584aab4d229dc396d0fb7875f29463a60e37ce9f8

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