Malicious PDF — malware analysis report

Static analysis result for SHA-256 35426a512e7f865c…

MALICIOUS

PDF

88.6 KB Created: 2021-07-15 09:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b41d8a77a1363fd40e226733dba54a32 SHA-1: 87e08bce9090dec8e03e344c9d5eb599f3ecbd3c SHA-256: 35426a512e7f865ceda037e1e6873b3051ef5d81903ff3e0de57d7183aca3267
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The embedded URLs and link farm heuristics indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/38aafad30e91e4bd6f5353220fe5abf5/89601267440.pdf
    • https://open-call.fr/uploaded/files/bepobapor.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa5d173219---paropopoxazajepe.pdf
    • https://combrooncom.com/contents//files/86109842419.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ed5d3e435---96460618768.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fadb5395bb---golowejadegomaxori.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/d2f067f9f051ab02ed045eab249ec089/letugefuvolakudu.pdf
    • https://hotelindigha.com/FCKeditor/file/gaboxemuvifab.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b120c7c76fd---2945646386.pdf
    • https://menuiserie-sainte-anne.fr/userfiles/file/81392991008.pdf
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/tizarujajotivozit.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a5aeb32db---16360704628.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084e6728159a---95628749197.pdf
    • https://heuresromantiques.com/upload/files/dobotivuwagututatebet.pdf
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/vitejoxeg.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dbdc3dbdb---pufotatefuveverikusafojir.pdf
    • http://physocare.com/Images_upload/files/gewolotanuzogezikukoxu.pdf
    • http://sonsuadogo.org/Images_upload/files/zosuvonuxewu.pdf
    • http://thamdinhgiadaiquang.com/img/files/morive.pdf
    • http://baaningdoi.com/file_media/file_image/file/89584577989.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed8d7beb22---56743796417.pdf
    • https://hinodanang.com/uploads/image/files/pavel.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cab+questions+and+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6c7.bin
750ddd2064fb9737b06997be401feaaf560f48b6c6f11e3371e5370a8ea6e249
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 17588 bytes
font_01_sfnt_off000124ca.bin
7510af85cc8a116775172c1979e65926a733c5da2a73c51de9fb25a26df6ea1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x124CA 10700 bytes
font_02_sfnt_off00013d62.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D62 16792 bytes