PDF malware analysis — malicious · 1b5bc2ca7e5fce25

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 04:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: cb88309b21c49508e2cda75c925ce7eb SHA-1: 00b0a03a98dd1893b0b33a32daaa2b31f8f8e3fa SHA-256: 1b5bc2ca7e5fce259046b561a2733289d58d6fa5482d99035489473feee4a642

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm for malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the distribution of further malicious content or phishing attempts.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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
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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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://ketchas.ru/uplcv?utm_term=dialogue+anglais+fran%C3%A7ais+pdf PDF link annotation
- http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/9f8614fe157182813d0126bb78602349/20347100155.pdfIn PDF document text
- http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/72906350017.pdfIn PDF document text
- https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867c0c60218---20615989449.pdfIn PDF document text
- http://csc0898.com/userfiles/file/20210801122958_b5vv31.pdfIn PDF document text
- http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e83d02fb6---notukonobinujive.pdfIn PDF document text
- http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e28d950e1e---1265971769.pdfIn PDF document text
- http://didongsinhvien.com/upload/files/dujewamasedetazojuv.pdfIn PDF document text
- http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5ed5bc3b8---8908374597.pdfIn PDF document text
- http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cc59b8eca4a---58036535577.pdfIn PDF document text
- http://bezpiecznamlodosc.org/files/file/642157003.pdfIn PDF document text
- https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/d7l574boitvh0d3froun5gp7oh/napixefuputetibux.pdfIn PDF document text
- http://www.pattyn360.com/upload/forum/files/72245682876.pdfIn PDF document text
- http://sapaelitehotel.com/webroot/img/files/84793015899.pdfIn PDF document text
- https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/518349d8b5925a40dde35d74c27075ff/95978832139.pdfIn PDF document text
- http://birnagarcollege.in/userfiles/file/37997009296.pdfIn PDF document text
- https://meesens.be/KrMee/Tekstverwerker/82720032137.pdfIn PDF document text
- http://atonoserver.com/userfiles/file/fukexogowuxexo.pdfIn PDF document text
- https://autopratichesas.it/file/kusenolurakaderanox.pdfIn PDF document text
- http://asvpp.fr/pdf/pagibinovutimi.pdfIn PDF document text
- http://cgpreceptor.com/ckfinder/userfiles/files/torovunagunabebopugis.pdfIn PDF document text
- https://computerzone.pk/file/93167196327.pdfIn PDF document text
- http://vogiantinhmach.com/media/ftp/file/44457731728.pdfIn PDF document text
- https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e4e1d878f---5402116427.pdfIn PDF document text
- https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/hlrf6bi0og8hvq1reccu6ejs95/84762372169.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_off0000dcb2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCB2	10872 bytes
SHA-256: `b4d0736244f9766c727507dc49bf1682aa20c2c184ddfeac56d7ebb5db976874`
`font_01_sfnt_off0000f5b2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5B2	20860 bytes
SHA-256: `8db2a6b167904291deb3e45374fb0036c7b967362b4033c3f772d1737a7e6dcb`
`font_02_sfnt_off000129ae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x129AE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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