Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b1e9bff3f7448e…

MALICIOUS

PDF

72.4 KB Created: 2021-09-08 05:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 837660a882c5297b879d7fe492e2dd1d SHA-1: 21f7b74341f1bc2afcd0efa73252fb809e893f7e SHA-256: 93b1e9bff3f7448ec9b4754d9e9709b53e760a05054b847e0315a52b331031ea
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of external links, many pointing to compromised websites or disposable domains, indicating a likely phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous external URIs and the PDF structure itself are indicative of a malicious document, likely used as a lure for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a582758436e---terigovotiribifovolu.pdf In PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/2c7423af13739c83ed76b19e0130df67/35389889247.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/83804317677.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/50444186906.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/95482273655.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c05de30f9---91868327826.pdfIn PDF document text
    • http://scro.ru/pic/file/27399523346.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/10055094012.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/84877563789.pdfIn PDF document text
    • https://soechi.net/userfiles/file/16517823614.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ca514139b---52199744738.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/82242317478.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/51976293412.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/24689077213.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/3554094068.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/27jjrp5d75pfpbnnlr9svu18a9/7032522043.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/674cdd5af0a6aefe9666b71cfc5edd84/murodoranavat.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160af79691ab57---zuwumavaxalufujogubodiwe.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/71801123244.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dca17a6b0f---damisu.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/baxefinowerodepalar.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faf55e170aa---fogulubesokuluvejikar.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/e517c6dad6432ddea453db34ab929d50/54301564683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=investment+banking+terms+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_off0000b890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB890 16520 bytes
SHA-256: 89fbbffd6e8cd9c00c8cc7d001003d74b1e0f9e459e2894db2faff4a4be9c4c9
font_01_sfnt_off0000e32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 10924 bytes
SHA-256: f08c30f05b7fbcf04a637aa7136dcb7faca18432c01c4222836d439a20b3b8cf

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