PDF malware analysis — malicious · 5d07d12c63ad1690

MALICIOUS

PDF

90.5 KB Created: 2021-09-17 06:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 25ac1647bb9fb3bc9ca20767599b1d8b SHA-1: 23a1f074feb662c2a51dc113e80d5bbebf9ce2f5 SHA-256: 5d07d12c63ad169069222cd5b3147f7f32878e313fabeace573116c45aad82b9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, with several pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9932

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://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/326448161.pdf In PDF document text
- http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sakifujarubagadiwiz.pdfIn PDF document text
- http://langmypham.com/luutru/files/60723924270.pdfIn PDF document text
- http://omeofest.eu/userfiles/files/23776437299.pdfIn PDF document text
- http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614224db91758---lepagusuvinimebudeb.pdfIn PDF document text
- https://marbletreasures.com/uploads/image/files/potefujebefukibabawizeje.pdfIn PDF document text
- http://kramnyca.info/img/upload/editor/file/lazewu.pdfIn PDF document text
- https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/161328b277e8eb---86375418404.pdfIn PDF document text
- http://galluccifaibano.it/userfiles/file/lomijijozuzofosifot.pdfIn PDF document text
- https://implant-drill.com/userfiles/file/51185221658.pdfIn PDF document text
- https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/li058uokjbgklsl3j2ui54k2e6/bezinafufu.pdfIn PDF document text
- https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/097d499f10d73a6bdf91e97f908d04bc/35602124196.pdfIn PDF document text
- https://dycmc.com/DATA/upload/files/202109120613341368.pdfIn PDF document text
- http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mumoxupoxulibowuji.pdfIn PDF document text
- https://thegioidongphuc.net/ckfinder/userfiles/files/47729544490.pdfIn PDF document text
- http://hiro-seiko.com/upload/files/sezekekujopi.pdfIn PDF document text
- http://carrasvilla.es/uploads/files/dunixefuwur.pdfIn PDF document text
- http://baloneacessorios.com/_upload/file///limipelivorofijulewopop.pdfIn PDF document text
- https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/281qq5cvbt1o7tgudcech3jk5g/58086683815.pdfIn PDF document text
- http://theponghop.com/upload/files/53675330743.pdfIn PDF document text
- https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1612f27b82e49c---putifawozuzivabaxepojuda.pdfIn PDF document text
- http://rideabikenews.com/user_img/files/wotijofimun.pdfIn PDF document text
- http://el-system.jp/uploads/2012/files/9906428341.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tap+tap+dig+mod+apkPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000de70.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE70	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f681.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF681	16408 bytes
SHA-256: `e1932303b938ca4c1e96ce01bfa668ce9d27c76431817f32b5e91b77d1096bae`
`font_02_sfnt_off00010d04.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D04	10240 bytes
SHA-256: `c8aa8b6770e5908d5e815ac38cce6f2ad4157658fc07ea085ebd125d5f99315b`
`font_03_sfnt_off000123cd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x123CD	22964 bytes
SHA-256: `acb0c59704e88d65efaf72876789bc7906284c091b704886c35b8b96caf15da8`

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