Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9a6124ebdbda07…

MALICIOUS

PDF

85.2 KB Created: 2021-09-01 17:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 40c4015ffbe88db97cea87678e5e60d3 SHA-1: b43e2f92310cd6b7439ef6214dda7aeeb6d873b5 SHA-256: 5a9a6124ebdbda0703a71322a76fd19d901b64213565b7907f198a7401c83957
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. These elements suggest the document is designed to trick users into downloading further malicious content, likely by masquerading as a legitimate file converter. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://solarwindependence.com/ckfinder/userfiles/files/31110830707.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e48ed07432---46622381115.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/24733982015.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a595a6f683---fiwuxonegagasazolavutiw.pdfIn PDF document text
    • http://artospace.com/pics/file/31704441735.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/bo16dp98va3q1i03k4lvfbdc9e/39880412919.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bc7b3dddf---92981767957.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/dffa1120dc37a4bde95e2915f150b267/pabonoxosuj.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/bokorukekelamipukug.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/8727583346.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/96192408326.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/11298032285.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/96557550958.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a87749f861---zodukekexane.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/dinidutakewa.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607980ef363c6---wudeja.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/tudenivalinus.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/sumiwesibojusorug.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210812171837.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/kogetimawo.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/guzivizasa.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/sulodawuza.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/giniwipikivupifetasewon.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/dexipusolumejapiforipig.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/66840148968.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9751e8040---45424822266.pdfIn PDF document text
    • http://rentaruedas.com/files/others/19303229384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=small+pdf+converter+free+download+full+versionPDF 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_off0000e4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CF 11108 bytes
SHA-256: 0719c564074e1a276744575ddd61e3fab11013d242d66b9c76a19cdbfae83ab1
font_01_sfnt_off0000febd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBD 17896 bytes
SHA-256: 80e08d9ee3536e11c66d5868a1159ebc104bf7ac8637265e78e681dab1c212d3
font_02_sfnt_off00012d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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