PDF malware analysis — malicious · 9d8356d675e2a302

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 00:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 37d4f98a17eab87b543f8fd9b0aba4a6 SHA-1: 96dbdff16569e5710b3ff7a00ff23e7a66e2a03a SHA-256: 9d8356d675e2a3022b2f8ef9e94bcce826c5a0e79732c9a7c8c98471f5d06d58

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external URIs and link farms hosted on various domains, many of which are associated with compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple links to potentially compromised WordPress upload directories suggests an attempt to host or distribute malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://garglob.ru/uplcv?utm_term=save+webpage+as+pdf+chrome+iphone PDF link annotation
- http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2d8c4565a---pupelexunibo.pdfIn PDF document text
- http://vietsonplastic.com/uploads/userfiles/file/15712694795.pdfIn PDF document text
- http://lnhaihui.com/userfiles/file/20210909235331_1695821144.pdfIn PDF document text
- http://alompar.hu/uploads/content_files/files/60130764314.pdfIn PDF document text
- http://massvt.sk/editor_uploads/system/files/jisused.pdfIn PDF document text
- https://nirkongrp.com/ckfinder/userfiles/files/81503454685.pdfIn PDF document text
- https://ph789.com/pinhsuan/files/file/sovosijozalizatamodanox.pdfIn PDF document text
- http://ebbers-schilderwerken.nl/uploads/files/jiwokavudaxebosinuko.pdfIn PDF document text
- https://chuyennhakienvangvn.net/upload/files/90193099878.pdfIn PDF document text
- http://tanphatinst.com/vietkiendo/upload/file/pafujegejeg.pdfIn PDF document text
- http://huthamcauquanggiap.com/upload/files/93272325359.pdfIn PDF document text
- https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/kisujinogugokik.pdfIn PDF document text
- http://e-kva.ru/admin/ckfinder/userfiles/files/supezakixajuxumugose.pdfIn PDF document text
- http://ducnhua.com/upload/files/5967061635.pdfIn PDF document text
- http://debnine.net/UserFiles/File/33185708735.pdfIn PDF document text
- https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/7b85c9a460d946b0e7afee9ddb44a9df/22854368999.pdfIn PDF document text
- https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/baf500a83d2bb0ad37b93ab940754ae3/beroruvepitemojorimagav.pdfIn PDF document text
- http://entrackintl.com/uploads/fofesuzok.pdfIn PDF document text
- https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f19724f547---12681572111.pdfIn PDF document text
- https://bhandarisurgical.com/ckfinder/userfiles/files/76478769636.pdfIn PDF document text
- http://ventima.ru/userfiles/file/54856212873.pdfIn PDF document text
- http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9dd524826---wokalimim.pdfIn PDF document text
- http://www.naraihillgolf.com/admin/userfiles/file/jelejixaposuvowotazad.pdfIn PDF document text
- https://bnbtravels.com/ckfinder/userfiles/files/tikugijonezoxuwuko.pdfIn PDF document text
- https://pasifikendustriyel.com/userfiles/file/budaparuradopajonedev.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_off0000d428.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD428	17960 bytes
SHA-256: `c0926758dce727fa992bdf6bccc4e44d266fd217e5282edba7022e59eeb00e62`
`font_01_sfnt_off0001023b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1023B	11292 bytes
SHA-256: `72f946a34a0719a0295fb1bbbac3bd170bdf0b57eb696dd561c615139cd61e40`
`font_02_sfnt_off00011c28.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C28	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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