PDF malware analysis — malicious · c4a02325b39bbef3

MALICIOUS

PDF

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

MD5: d4a9ee6817ac32f2a34802626612909c SHA-1: 783dd60b4db28e5776015ee4c60eaa92db609268 SHA-256: c4a02325b39bbef32c831d5196ad3a0e9a08438df697539394f670a08ed7082d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm or phishing lure. The presence of these links indicates an attempt to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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 http://fszhenjia.com/upfolder/e/files/20210902192244.pdf In PDF document text
- http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebced01dc5---97305616129.pdfIn PDF document text
- http://smenergy.kr/uploaded/file/14421056816139834d816e5.pdfIn PDF document text
- http://steakclubhn.com/campannas/file/86897540449.pdfIn PDF document text
- https://distriparkbotlek.nl/userfiles/files/vakinoziwivugikuwuw.pdfIn PDF document text
- http://caogenzhiben.com/filespath/files/20210906041134.pdfIn PDF document text
- https://szekszardportal.hu/userfiles/file/5382407637.pdfIn PDF document text
- https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16132832aa7d1d---97820010474.pdfIn PDF document text
- https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/xeliligifazamegofukamovis.pdfIn PDF document text
- https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16134cf106dd23---lemotasulugivodinivelox.pdfIn PDF document text
- http://kazuma.ru/ckfinder/userfiles/files/74910638137.pdfIn PDF document text
- http://capthepcongtrinh.com/uploads/news/files/nokogabeseluguwupow.pdfIn PDF document text
- https://goacetours.com/ckfinder/userfiles/files/depepuwipesoxox.pdfIn PDF document text
- https://skiclubraonbaccarat.fr/pdf/59749444973.pdfIn PDF document text
- http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edeb70c4a9---94714168359.pdfIn PDF document text
- https://ocw.tw/uploads/files/katijazufoxowuga.pdfIn PDF document text
- http://thailaundry.com/imgUpload/files/31512732667.pdfIn PDF document text
- https://gosselindesign.com/images/from_fckeditor/fichiers/moxunu.pdfIn PDF document text
- http://rlmlaw.com/images/edit_images/file/zetawisadataz.pdfIn PDF document text
- https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/45115455601.pdfIn PDF document text
- https://washlounge.in/ckfinder/userfiles/files/poletuwofigo.pdfIn PDF document text
- http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/gupikofolawilojatirujon.pdfIn PDF document text
- https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132b5b046c3b---debelejonigomikegodeme.pdfIn PDF document text
- https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bc3578c54---3491136328.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=car+parking+2020+hackPDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e718.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE718	18764 bytes
SHA-256: `a34b35e105fb5991df9fe6d1886663120524b0985697ed6023919b5821457887`
`font_01_sfnt_off0001181d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1181D	10456 bytes
SHA-256: `e653f384d9b4247a587fb8366607c47a854336cb02daeb9cb60dfa3871a390b2`
`font_02_sfnt_off00012fce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12FCE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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