Malicious PDF — malware analysis report

Static analysis result for SHA-256 650b5d1411d35f7e…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 05:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f0c043b5904d3f49597c09d8bc990290 SHA-1: ae015fefc4a01c7efe190717682dbfff5d903354 SHA-256: 650b5d1411d35f7e73a8f6b719aa86b99035f520e690e9adbe350047a2c64a9c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier. It contains multiple external URIs, including one pointing to a raw IP address, and links to what appear to be compromised WordPress uploads. The PDF structure and embedded content suggest it is part of a phishing or malware distribution campaign, likely using spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://streathamtaxi.com/survey/userfiles/files/narigaxulesi.pdf In PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161418890eea0b---23641729550.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/sukuduvakilerewojipene.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/xewefuteda.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/35740019934.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/lifezivuxowiwepudigenifa.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210917095934.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/99648031245.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109082051104269.pdfIn PDF document text
    • http://aimic.com/userfiles/file/18627621643.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/fapivasadivitosapitetepin.pdfPDF link annotation
    • http://merklink.nl/site/data/ws/files/13468309559.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b58e2dd2e1---85525012850.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16143da35c8b0f---benonij.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/88653247293.pdfIn PDF document text
    • http://mimpishio.com/contents/files/88380673505.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/fejabobi.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/25660089220.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/399f8c584f5d3a5f93d1e9269b8f73fe/41005775773.pdfIn PDF document text
    • http://nature-revive.org/files/file/96169237200.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/kexinikekuvukawozuxavixi.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/safenegibawuvi.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135659119c26---32317468937.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/bimonabenedogesovupuzab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=benny+loves+you+streamingPDF 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_off0000d813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD813 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02A 10784 bytes
SHA-256: 75a2973475490c4a41b4d55f02a0a5da61736e752ea72865d021e6f26e5031c7
font_02_sfnt_off00010915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10915 19144 bytes
SHA-256: 92a227f932a051c62f89061ac1a162f9f379be8e6689993b4e767ff5b4135c43

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