Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3807b559167ce2c…

MALICIOUS

PDF

81.5 KB Created: 2021-08-26 23:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1388cdb8e02034c7b818b652d57b1a35 SHA-1: f527d9d00c33f2dcb386f2e69ddaeb4f2f3e2be8 SHA-256: b3807b559167ce2ce9e5fa232597aff1bd7cf77a486f291d44c2f91dbb8658f0
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, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external URIs strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://mchs67.com/clients/6/60/601da637195afcc8544498be66ee72b0/File/pugukutijerelepefituf.pdf In PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/39737363444.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/zujobudasawok.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/pinafekusofimupuwone.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076648f40281---7471663642.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6e466c926---jopanuzogegeti.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/lakivavazudoserovodof.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/tilaxoset.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/sezubojila.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/8193092764.pdfIn PDF document text
    • http://alkanboya.com/files/file///mimafomefexusu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a8c300de262fe5225b67eafacc2c5c0e/kisepuguweduwamodij.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1611da4c3ab1fa---zevilirupukade.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b44dfcc7913---57461176385.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098853081b16---joxuforamivilupizibu.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///72517601139.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/65653142440.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0136b3e027---73700015566.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612171485e279---fusovizukipalomi.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/jubika.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/baxaketu.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612171b1e9a61---75674996268.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077cbb9a734e---nefevi.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/tafawopapizaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=long+term+exercise+goals+examplesPDF 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_off0000dc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC01 10776 bytes
SHA-256: e30d0704e4c75d4bb1585b073b432ea163b817cc1de216f47a7afe5cddeddcf7
font_01_sfnt_off0000f4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 16480 bytes
SHA-256: 7df3b6d339b6c9dff541b444468bdc4e0ced2c0ec8f908403f8ccabab108e460

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