PDF malware analysis — malicious · 9ca8101bf9de5fd1

MALICIOUS

PDF

87.9 KB Created: 2021-07-03 03:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29

MD5: b76156afe7a6fa0105334b5109c408a4 SHA-1: 1c8177fad40f8e957245fdccaf29da49c9d6d49b SHA-256: 9ca8101bf9de5fd1dd791c77f5c4ad315d1c2513becc426cffcafea4fd7cc1e0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs and link farm indicators suggest the primary purpose is to redirect users to potentially malicious sites. No scripts were extracted from this sample, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://allytemp.ru/uplcv?utm_term=quoting+a+song+in+an+essay PDF link annotation
- https://alatheir.com/atheirwsfiles/file/23968371469.pdfIn PDF document text
- https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/294cb37b5d484ecbb13e39aee9152bb8/rafez.pdfIn PDF document text
- https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d04bd28cc---7116997116.pdfIn PDF document text
- https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/3b1de642bf0162b2449c31df6d96adeb/gazekenupalo.pdfIn PDF document text
- http://nelly-design.ru/upload/files/bosakorofikapepad.pdfIn PDF document text
- https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/gnq52qod91p06siipnm7a4v915/xobezoxujalez.pdfIn PDF document text
- http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073e9de39114---ruwesamilasusowoxixom.pdfIn PDF document text
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72da0a4929---rubamukotuvawunepenefevo.pdfIn PDF document text
- http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/2degg9iub6t83g68864b0m19t3/nimipesi.pdfIn PDF document text
- http://russkiivopros.com/images/FCKeditor/file/rezigodegagevutigenutas.pdfIn PDF document text
- http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160823235a9ba9---rolobexi.pdfIn PDF document text
- http://akinmedical.com/uploads/file/68750135187.pdfIn PDF document text
- https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/85742b08bd6ab2da4bcf42edc6987841/94551758435.pdfIn PDF document text
- https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943226ba28c---rudafawobamawanok.pdfIn PDF document text
- https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4302031642---52414923385.pdfIn PDF document text
- https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/fgj9c9m1segjpgosotnm0m7h2d/66165231044.pdfIn PDF document text
- https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/55af044bbde0ad361d389e9b4aa9c3bf/fopepuvekarupewexiraw.pdfIn PDF document text
- http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826648c6d17---88072515438.pdfIn PDF document text
- http://macautemple.com/userfiles/file/3039570974.pdfIn PDF document text
- https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d931323f2b4---tiwepaxi.pdfIn PDF document text
- https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/3aa8cbb6ad140ae243a033c0cc04f94e/51900920823.pdfIn PDF document text
- http://indel.sk/userfiles/file/lonewusujibeb.pdfIn PDF document text
- http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/2995762139.pdfIn PDF document text
- http://accessibilite-salle-eau.com/ckfinder/userfiles/files/33583854361.pdfIn PDF document text
- https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/dp7ajoqhdoqvspgf72phhao997/59976255858.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_off0000f7d4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7D4	16824 bytes
SHA-256: `c2eb85fd05aefbc1a928a2fd8e160957b09de3c4a5667ef697a31baa6399649a`
`font_01_sfnt_off0001234f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1234F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013b66.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13B66	10408 bytes
SHA-256: `9155f8b739e172059c2719f3c8a7c71bf72b65f6b35db5740c05204be150658e`

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