PDF malware analysis — malicious · cd91b05e1fb336af

MALICIOUS

PDF

84.7 KB Created: 2021-09-08 04:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 472d16d4a88716f06879c9ebc0ca942a SHA-1: e2513b77103283ed46d75544213003a698de2284 SHA-256: cd91b05e1fb336af8fa19dc26f1535d113427a02e83d3dbab47f8cc647e16b8f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to websites hosted on compromised CMS platforms or disposable hosting. The presence of numerous links, including those with 'utm_term' parameters suggesting search engine optimization tactics, points towards a phishing or malware distribution scheme.

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://meble-tk.pl/userfiles/file/kitesadunorubivolifabunon.pdf In PDF document text
- http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d48bf1806---wifoxadifuloso.pdfIn PDF document text
- http://contelex.it/userfiles/files/75909056218.pdfIn PDF document text
- https://basisangka.com/contents//files/dokolimipeto.pdfIn PDF document text
- http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/pafetoxogorikedi.pdfIn PDF document text
- http://sbox-technology.com/upload/datoteke/vawesudegoludo.pdfIn PDF document text
- http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/zamokinafegesajef.pdfIn PDF document text
- https://pisangmanis.com/contents//files/97755459133.pdfIn PDF document text
- http://loveperfectionschool.com/upload/file/33835688478.pdfIn PDF document text
- https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3886c7ec0---nowaborititekomo.pdfIn PDF document text
- https://eghamatyab.com/basefile/bainbookcom/files/98017820455.pdfIn PDF document text
- http://goldenteriyaki.com/uploads/files/71243524242.pdfIn PDF document text
- http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/h6on5b115fehe8blcre2s790e0/97033615603.pdfIn PDF document text
- https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/2111df3334e6a83bcffc1274d9b6c569/jolajodedur.pdfIn PDF document text
- http://topoint.cc/userfiles/fckFile/20210719235734.pdfIn PDF document text
- http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe665287e28---33133320765.pdfIn PDF document text
- http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/88996799124.pdfIn PDF document text
- http://universalestetic.com/userfiles/file/18653899627.pdfIn PDF document text
- http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087e43e5c059---64575230783.pdfIn PDF document text
- http://gpszone.hu/upload/userfiles/file/3499166880.pdfIn PDF document text
- http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af0e8aba665---22290054551.pdfIn PDF document text
- http://turinhotelcompany.com/userfiles/files/rutidojiwagilisometo.pdfIn PDF document text
- https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761c1c28e61---tipalusodabuwejoji.pdfIn PDF document text
- https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/13b05987cf24d57a4932aa55fc31e58f/68094483848.pdfIn PDF document text
- https://rajakeempat.com/contents//files/kufugopuwemibewosotuwuj.pdfIn PDF document text
- https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/oanh4gbopseuc7llthchlnfb6i/74162467575.pdfIn PDF document text
- https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afb93044e91---newojevoputozeruzenonos.pdfIn PDF document text
- https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749981a3412---40007823711.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=powerpoint+to+pdf+download+freePDF 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_off0000e702.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE702	18084 bytes
SHA-256: `9b8dab522460eb2a6c1b699e9c90e43cd737a749f5a68a7d0101b13a087d03e7`
`font_01_sfnt_off00011535.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11535	10408 bytes
SHA-256: `15e9af3cd9baf7d1c6cf62442d0a1ac211a67b938dd93b3e9db34f9340e2a819`
`font_02_sfnt_off00012ceb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12CEB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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