PDF malware analysis — malicious · 814abe2e4864a37d

MALICIOUS

PDF

82.4 KB Created: 2021-06-26 05:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 9a16ceb00f58abf186e7bf144798ea94 SHA-1: bbc798e8e649ce6942058cc1ffba42b3a5bae4ee SHA-256: 814abe2e4864a37d6eac3b130b293511b8e41d54c3217575c37838cd099fb714

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it functions as a link farm for phishing or malware distribution. The heuristic 'SE_SECURITY_BYPASS' indicates the document may instruct users to disable security software, a common tactic in malicious documents.

Machine Learning

Nyx PDF Classifier malicious score 0.9943

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
Security software disable instruction high SE_SECURITY_BYPASS

Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
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://cructi.ru/uplcv?utm_term=the+walking+dead+download+free+full+version PDF link annotation
- https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5m3m931bh5os3vdqgrk4t8sgor/jewonuvelekopuk.pdfIn PDF document text
- http://babamoleskine.com/files/file/lagibefatitedaro.pdfIn PDF document text
- http://bukharaatlanta.com/sites/default/files/file/43236065020.pdfIn PDF document text
- https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa41debd7ee---34948860808.pdfIn PDF document text
- http://hysansam.com/fckeditor/userfiles/image/paribipujawomajivipases.pdfIn PDF document text
- http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160803a801406d---kudetezuxeminidowebo.pdfIn PDF document text
- https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/nuoau0gcjedfp51rm9eq3c5f0a/xofosawaneta.pdfIn PDF document text
- https://arerp.kr/data/file///78705177943.pdfIn PDF document text
- http://bi-acaovo.com/upload/files/7871372354.pdfIn PDF document text
- http://aarogyamedico.com/userfiles/file/9454843715.pdfIn PDF document text
- https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/a8c8cc182e85a56ba53fee770b5f8fbf/17582240912.pdfIn PDF document text
- http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d227b708fb3---74729616484.pdfIn PDF document text
- https://hotelmitrutarija.com/uploaded/files/6201941893.pdfIn PDF document text
- http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a33346af1d---24874669750.pdfIn PDF document text
- https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74e8bee6c---zupoxedixavogurix.pdfIn PDF document text
- https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/u2qedtpb27u5aabrc3r0ulorb6/lorarinivubawakejinufu.pdfIn PDF document text
- http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/ad6842cfaa52244e36be396a914f2ba1/wukuvizo.pdfIn PDF document text
- https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/0c8b4c989d568f3021494d361392f19e/muwojulopirijifodupok.pdfIn PDF document text
- http://jmvlpslimited.com/ci/userfiles/files/27129414868.pdfIn PDF document text
- https://upbilbao.com/ckfinder/userfiles/files/85857267096.pdfIn PDF document text
- http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846063d92ba---xetupavonukamupoludidolaz.pdfIn PDF document text
- http://altaprecision.com/userfiles/file/vetir.pdfIn PDF document text
- http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070fc3273b03---buzebe.pdfIn PDF document text
- https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c10237ddad---27212374706.pdfIn PDF document text
- https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/ba0339a3de9cd06342de6efd61afd3a8/61448448817.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_off0000da45.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA45	10840 bytes
SHA-256: `b3a2ac9f6bbda8cf78128a5d8c25d32e02b875b41d4fa96e1390543d807641e0`
`font_01_sfnt_off0000f312.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF312	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010b24.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B24	18164 bytes
SHA-256: `6087a3c87506ba915e482a48674a5d035ec1dd1ee960461b13c6f62c826c55ad`

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