PDF malware analysis — malicious · b49acfded5e4ac72

MALICIOUS

PDF

73.2 KB Created: 2021-09-02 04:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 952d353c0f16881cb822ac5467ea7252 SHA-1: d5b919bef4354db767abc158e3cfe930b39a0347 SHA-256: b49acfded5e4ac7233bb5961927e0de87815154148dc0d9f18d0de93a7c5a94c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs, such as 'https://ketchas.ru/uplcv?utm_term=tim+minchin+commencement', likely serve as lures for phishing or to download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9948

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://ketchas.ru/uplcv?utm_term=tim+minchin+commencement PDF link annotation
- http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb59d51ba0---46579214699.pdfIn PDF document text
- http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eadde9b03c---fesizikixegidimuxovobi.pdfIn PDF document text
- https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/c9b4540bccf194eebe618b8028397485/71605002825.pdfIn PDF document text
- http://b-solutions.net/userfiles/file/97767911090.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/o3dldlr3b1afdnjbujadrejbe7/67061776846.pdfIn PDF document text
- https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/7c05212ec99b7709c2aa553f549ff791/dexepod.pdfIn PDF document text
- https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/75c361af3f9ccb53772a65339371356f/tadonomegoxabapowaxakup.pdfIn PDF document text
- http://girisimcilikproje.com/resimler/files/kerexopobinudugodufifave.pdfIn PDF document text
- http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8a24e64a3---femodesogu.pdfIn PDF document text
- http://blackivy.pl/userfiles/file/18872765122.pdfIn PDF document text
- http://df-2.de/images/daten/file/72236963255.pdfIn PDF document text
- https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/b39ca7a21f8b24a85cc4914999c75544/badakegiropuvegojaku.pdfIn PDF document text
- http://interel-rus.ru/test/sites/default/files/file/18517285792.pdfIn PDF document text
- https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdfbab37d3---42087342677.pdfIn PDF document text
- https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/6vp4eq3l29bece29qfj5i3fln7/wavarofazagofevijifusana.pdfIn PDF document text
- http://postelezmasivu-brno.com/ckfinder/userfiles/files/10355544436.pdfIn PDF document text
- http://kiapelhrimov.cz/UserFiles/File/55780059722.pdfIn PDF document text
- http://grossfamilyreunion.com/clients/0/00/00c8ca1d7e0432e0ca4c178cf0a97985/File/gosuturawokufevujofegel.pdfIn PDF document text
- https://aftaplan.com/works/peepsparty/html/upload_files/file/zafavukojesosoxidabuxi.pdfIn PDF document text
- http://hublihorse.com/uploads/userfiles/files/12423580629.pdfIn PDF document text
- http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fe573b20---85687299322.pdfIn PDF document text
- https://akapacha.com/userfiles/file/85659374260.pdfIn PDF document text
- http://pamat.ro/UserFiles/file/80444576079.pdfIn PDF document text
- https://aonetreks.com/uploads/file/pirugilotujosunoxopisir.pdfIn PDF document text
- https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/89e666c1040b203d0304b408f33a70b6/pidulijozedogon.pdfIn PDF document text
- https://tomas-music.com/contents//files/5404211394.pdfIn PDF document text
- https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8a39ea543---53538360284.pdfIn PDF document text
- 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_off0000c259.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC259	9980 bytes
SHA-256: `1a014b9474416ed7ac587b30e417797ebc6870f9556d9abec943ffe373049543`
`font_01_sfnt_off0000d83d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD83D	15164 bytes
SHA-256: `eb4c982a186e5c83a8607686ea37f5b22266822fc7bebf1d9864a004d9442230`
`font_02_sfnt_off0000fe6d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE6D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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