PDF malware analysis — malicious · f37e42faa98016db

MALICIOUS

PDF

72.9 KB Created: 2021-09-14 03:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: e34acc2809af4d821f368c1ef45315d3 SHA-1: 1d0573492d30fd266523d4cdb8aaa6f89cb98178 SHA-256: f37e42faa98016db73f445ca1dd3309e17eb0ffd4021bc8ab8e703b3e5dbfca0

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a phishing or scam campaign. The 'SE_CALLBACK_LURE' heuristic indicates the document may prompt the user to call a phone number in a deceptive context. While no scripts were directly extracted, the presence of numerous URLs and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

Heuristics 7

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.
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://medvor.ru/uplcv?utm_term=how+to+add+contacts+to+new+phone PDF link annotation
- https://www.aukuras.org/ckfinder/userfiles/files/tunotazuwa.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1d95a7cde---41344699210.pdfIn PDF document text
- http://jumpinfit.it/userfiles/files/mixuxiboxob.pdfIn PDF document text
- https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/05206f9ef433cf942230d4a2861165af/ladara.pdfIn PDF document text
- http://youngdongtec.com/userfiles/file/49433644774.pdfIn PDF document text
- http://aydinservis.com/ckfinder/userfiles/files/50326467043.pdfIn PDF document text
- https://matao.ro/app/webroot/files/userfiles/files/jadunevarabewipununafuno.pdfIn PDF document text
- http://idroter.org/userfiles/files/fuxifemopedimebam.pdfIn PDF document text
- http://carszana.com/image/upload/File/ruxaliguwowivufotesasolow.pdfIn PDF document text
- https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613586a9a8f88---6458636262.pdfIn PDF document text
- http://upservice.expert/admin/ckfinder/userfiles/files/2041405384.pdfIn PDF document text
- https://presentkompaniet.com/img/content/file/10876510151.pdfIn PDF document text
- https://jbdclothiers.net/emailer/userfiles/file/56180162356.pdfIn PDF document text
- http://around-sicily.net/userfiles/file/mujudajosageduke.pdfIn PDF document text
- https://nnt52.ru/userfiles/file/3218915579.pdfIn PDF document text
- http://eggtesting.com/admin/uploads/file/19730690344.pdfIn PDF document text
- https://adminico.nl/userfiles/file/65207289503.pdfIn PDF document text
- https://ewastexperts.com/userfiles/files/jatozelobolevumogavaru.pdfIn PDF document text
- http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/cgdvnvfa7t1fr0no7n5cnphdi3/83557214464.pdfIn PDF document text
- https://santchavarabed.in/ckfinder/userfiles/files/fivedunuradil.pdfIn PDF document text
- https://kimansion.com/uploads/file/81594594181.pdfIn PDF document text
- http://cnsgafgl.netsociality.com/upload/files/21801613725.pdfIn PDF document text
- http://ilink.pl/userfiles/file/nuvevorexuwibuxisopezujo.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_off0000bb18.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBB18	10452 bytes
SHA-256: `a04afaa93ec36ff83dd39d298912966994efbd98ae1a9d7fe13d0a866015be0f`
`font_01_sfnt_off0000d2c3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD2C3	17188 bytes
SHA-256: `5e28ea6f34121620049b3f640ea1c86719bc51a0d57a117b4cfd1015fc7acaf3`
`font_02_sfnt_off0000fe3f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE3F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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