PDF malware analysis — malicious · 343e5937d6f50600

MALICIOUS

PDF

92.9 KB Created: 2021-06-26 12:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: d8103255f6a750637919fb7c13599258 SHA-1: deff2197937f5f772db3b452225de131f080baba SHA-256: 343e5937d6f50600e3ba46cc52a0677f50aac3f682c268fc9bb56a18b9cc04dd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm pointing to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9924

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 https://ketchas.ru/uplcv?utm_term=what%27s+up+tab PDF link annotation
- http://bright-mineral.com/uploadfile/file/2021051419301240.pdfIn PDF document text
- http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160abd221111a8---56439307374.pdfIn PDF document text
- http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4136453990---45736322453.pdfIn PDF document text
- http://campbellelectronics.com/uploads/10657597364.pdfIn PDF document text
- http://etnorom.hu/pictures/kumos.pdfIn PDF document text
- http://debden.org/userfiles/file/bozodibemavebobevepubeju.pdfIn PDF document text
- http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b539e597384---xuxomekuf.pdfIn PDF document text
- http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160701a21b9390---wumasakejuvanaripegis.pdfIn PDF document text
- http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6cb478869---movupagozarobew.pdfIn PDF document text
- http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609f41f762ce1---lepatajutajikujasasi.pdfIn PDF document text
- https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b89ff70aed3---11815419428.pdfIn PDF document text
- http://provia-events.de/pics/fotos/1/file/rivowifem.pdfIn PDF document text
- http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4b52966f9---70188637169.pdfIn PDF document text
- http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/7639590612.pdfIn PDF document text
- http://ranaghatpchsschool.org/userfiles/file/sufesowobufamerivojap.pdfIn PDF document text
- https://master.plus/wp-content/plugins/super-forms/uploads/php/files/7e8e14d2906ea3f0d30f1fe94fc8c32d/49926086262.pdfIn PDF document text
- https://roweryelectra.eu/app/webroot/uploads/file/16198935972025.pdfIn PDF document text
- https://triosms.com/userfiles/file/1412788033.pdfIn PDF document text
- https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b9d162634---wowenomaw.pdfIn PDF document text
- https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/ba9b41c328280107b750329952f59f56/35857337656.pdfIn PDF document text
- http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608430ee40da8---ponuxitisamebibawabameki.pdfIn PDF document text
- http://zafirkort.com/uploads/files/61535446578.pdfIn PDF document text
- https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/dfd5b287586994ec0e0520658026b7bd/2853343194.pdfIn PDF document text
- http://alexlunacoach.com/img/editor/file/rifusumudumatofaf.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0001010b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1010B	1792 bytes
SHA-256: `ab6bd8619fc99182091ed884df8e384143a4f31982a5a8b7f531558b4203f358`
`font_01_sfnt_off00010982.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10982	10020 bytes
SHA-256: `7555ae37db375039e00e54fd56aac3cda83486d40f7f1d535ea6168e49f84bb5`
`font_02_sfnt_off00011fb0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FB0	17784 bytes
SHA-256: `b27eef455981edf854b45ec004687d1e77fabde8a62e35a28ceee48525a1cedd`
`font_03_sfnt_off00014dd4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14DD4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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