PDF malware analysis — malicious · 288c3cd361a6c356

MALICIOUS

PDF

74.6 KB Created: 2021-06-25 14:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 4c43895608fb5b7670991f73611da774 SHA-1: 658edf73257ffa07b6f6e4dcb50f6c5ea304bbac SHA-256: 288c3cd361a6c35693ba75e2575fc8fc7b4229287d28df92cb0a5864cd9e9aa0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

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://infrive.ru/uplcv?utm_term=response+to+how+was+your+day PDF link annotation
- https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e85cda77a6---zojaraloxegajasadi.pdfIn PDF document text
- http://kmkonsult.cz/userfiles/file/9708456687.pdfIn PDF document text
- https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/69385a370906cba793250fc92974c122/ribovoroxijo.pdfIn PDF document text
- http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0dd130286---bumotuzi.pdfIn PDF document text
- http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfdabddc06---gilikuverukobuxarudade.pdfIn PDF document text
- http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/zutatigafiv.pdfIn PDF document text
- https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/455q9skb6e6ktbh89dq1ptq2h4/lupenirutagemonin.pdfIn PDF document text
- https://akapacha.com/userfiles/file/nojajudova.pdfIn PDF document text
- http://abroadster.com/files/jimave.pdfIn PDF document text
- https://blokhol.com/upload/files/26892608492.pdfIn PDF document text
- http://alexlunacoach.com/img/editor/file/lofodasaluzanuguzowefovub.pdfIn PDF document text
- http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/panujifunedolug.pdfIn PDF document text
- https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba657bb6082---75881143466.pdfIn PDF document text
- https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/30188c94e734d9b084abc3cb09d010c1/lelefutepewib.pdfIn PDF document text
- https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddf8481dc1---10382837293.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_off0000c3a8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC3A8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dbba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBBA	16064 bytes
SHA-256: `a67fe1af2554aadb96009e579462a217a8e038140133b1efbef01bc578209691`
`font_02_sfnt_off00010527.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10527	10696 bytes
SHA-256: `7ec79ec84c644896b1bb7cc7b055769ece9d7624c6b0cdf2479cf0dc26decccb`

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