PDF malware analysis — malicious · ce1eb8fcae1589b0

MALICIOUS

PDF

83.9 KB Created: 2021-09-03 19:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 96e4f6f5bd587ed80fcb1541dea8236a SHA-1: 99f9f2781d4ef8c98d2a95c1b057fc5562d6f43d SHA-256: ce1eb8fcae1589b0149b40aa24aa12b55331a97f03d73d9a48fdc8dff0dbecc0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection names point towards a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

Heuristics 6

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.
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://citra.cl/userfiles/file/1638702082.pdf In PDF document text
- https://olterus.org/contents//files/xositotadob.pdfIn PDF document text
- http://best-infosystems.com/userfiles/file/19480794635.pdfIn PDF document text
- https://eobliecky.sk/userfiles/file/97121327826.pdfIn PDF document text
- http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b48339072---94294154684.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f712efcb1---41984464374.pdfIn PDF document text
- http://primeasset.hu/fileok/file/mafowufuwurewitasep.pdfIn PDF document text
- https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b882d7750b54edeefdc73ab588fa98b4/naritipifaxipawezunipipop.pdfIn PDF document text
- http://studioguagnoni.it/userfiles/files/52790642327.pdfIn PDF document text
- http://piqiso.ru/userfiles/file/1045512431.pdfIn PDF document text
- https://psychotherapie-coeppicus.ch/userfiles/files/guwakupaxovokomemijopo.pdfIn PDF document text
- https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/2d5b800d6f39c7a4185dd2c2ffa282fa/25352770496.pdfIn PDF document text
- http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22f7b48f43---97423075967.pdfIn PDF document text
- https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/gln4o3dt173oisl8k2smvsbeu7/79323973830.pdfIn PDF document text
- https://gencerenerji.com/resimler/files/nezadevapelawak.pdfIn PDF document text
- http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/eb8df93d8e871b045abbf40d798f0782/45534883281.pdfIn PDF document text
- https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744a8237d48---6764283495.pdfIn PDF document text
- http://armanetti.com/images/71996637453.pdfIn PDF document text
- http://fuga-hotel.com/CKEdit/upload/files/64457055841.pdfIn PDF document text
- http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107f6a13bc59---forafew.pdfIn PDF document text
- https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2df406f8bd---26857270316.pdfIn PDF document text
- https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/hmnb25it0q4lana37ibgkiqi20/64357271164.pdfIn PDF document text
- http://kimwendelldesign.com/ckfinder/userfiles/files/batup.pdfIn PDF document text
- http://ministerium.pt/files/84159710165.pdfIn PDF document text
- https://reparationmobile.net/userfiles/file/boxanaganelofodavojofemi.pdfIn PDF document text
- https://irish-setter-zucht.info/ckfinder/userfiles/files/39148664252.pdfIn PDF document text
- https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/s2afgsa5pa0rnjqf8tb9hsll0o/18873906842.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=horaire+priere+agadir+2018+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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ddbe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDBE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f5d0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5D0	20168 bytes
SHA-256: `0fb986c6bc1f09aece1635f4adf3f65aa97f2cab4f39e3045e2e443229760f78`
`font_02_sfnt_off00012813.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12813	10752 bytes
SHA-256: `9f5a90e3ef1de02ea8bfcf82745c583fc2507cf0e31538f89fd896e8d3a764d9`

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