Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9471a351c04a768…

MALICIOUS

PDF

87.8 KB Created: 2021-07-02 23:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 909ac52d04463eae65513a33d97fb599 SHA-1: 618cdb8e44eeb865477f6cbd5831be2afc8e0c94 SHA-256: b9471a351c04a76857784191ab6ed880211bcd4f3df109b197082aeb1e492731
196 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The 'SE_CLICKFIX' heuristic suggests a social engineering attack where the user is prompted to execute a command, likely to download and run a secondary payload. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/kgb0g7c076191qmq11j4rg6lhr/4205499277.pdf In PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43bfe61b54---99665448292.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/24876890886.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0cf3192a7---51447157820.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/bb4f28d922c5c2768819a2e0f41704b0/rejutegevexidof.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16231571631415670774.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/810cf0959698c1e0453cb5d89d1290a1/purerekuf.pdfIn PDF document text
    • http://foodsafebox.com/ckfinder/userfiles/files/62682658113.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b25055ecff5---86001865917.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/b8330f14a7a8e395e63fbc6ea5857b23/wivisex.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/3cef1bc2b340e52e6ae87d43ec5f4a0d/zozosadivojewozes.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/7b9922a25897455d726d9b290241eee8/71439855904.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de13c3c20a1---zebemawafunuzupibeto.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/70435388593.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84cbd6d83d---posonamamula.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/06hst373amjjnv4o2vmfnshii5/jikadawiputurageroge.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607887999c3d6---54090458184.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/jomenawikikavalujimek.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/87866027960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=stand+by+me+rock+songPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF076 10996 bytes
SHA-256: ca90dc45af0f61faa169e90ca844c57b6fe09a7982b8ccd0d56235623b51dcfb
font_01_sfnt_off000109d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E8 18476 bytes
SHA-256: bc215560de9d204b83f051e514c47c13acbf11e624096cbf672bb059727019bf

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