PDF malware analysis — malicious · 2f2ad4a833ec8876

MALICIOUS

PDF

92.2 KB Created: 2021-06-27 02:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 70cee3c13c0fa5aade8296b0c2e536cb SHA-1: 2b96547a6d885595a11253edcca5bfae5af86828 SHA-256: 2f2ad4a833ec8876c2345f33348001ea8cb1f5da02d770a75d6586ea8ae0ad31

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, indicating a likely phishing or malware distribution campaign. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. The document body was unreadable, but the heuristics and URLs clearly indicate a malicious link farm.

Machine Learning

Nyx PDF Classifier malicious score 0.9966

Heuristics 5

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://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160afcd3f22074---79600279897.pdf In PDF document text
- https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/07a44a2b55e62032763e6d4d44a02d30/lipasu.pdfIn PDF document text
- http://hutbephottaihaiphong24h.com/upload/files/95042242434.pdfIn PDF document text
- http://cz-synergy.cz/data/file/58376646128.pdfIn PDF document text
- http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609067384781a---dupivib.pdfIn PDF document text
- https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/d5c62c95e6c8005fe3795e0bc61f7b0c/giluputopazubikufozere.pdfIn PDF document text
- https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/9927f7e214683fcdd25f5ec9ef40f4f9/kusawazidimid.pdfIn PDF document text
- https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/bfaf38c23f982c840f6c9b4c77bd743e/95088881638.pdfIn PDF document text
- https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/me9srr6n2s63d5n4btalaqvj4s/97961222729.pdfIn PDF document text
- https://caribemed.com/userfiles/file/merumobe.pdfIn PDF document text
- https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/44209e2a92e2de8efd405b4597649a69/82944660251.pdfIn PDF document text
- http://anhuicrew.com/upload_fck/file/2021-4-29/20210429142421559942.pdfIn PDF document text
- https://hissekurban.com/resimler/files/20176287316.pdfIn PDF document text
- https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad3e2c0359---lajoxubidabibolewofemika.pdfIn PDF document text
- https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/66e9c91248d5f278a5a95127a6a64e3b/wisupixogejezov.pdfIn PDF document text
- http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qack5pck358s3vig5adgf7inc3/39419429763.pdfIn PDF document text
- http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a5876c8fd---zokinogonejo.pdfIn PDF document text
- https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607712331ea44---dixigizexedibaxafur.pdfIn PDF document text
- https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3a5374fd2---20834251517.pdfIn PDF document text
- http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a08eddac03---fabewi.pdfIn PDF document text
- https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ejbsc8s7501mdcmagih51agefs/67551280976.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=which+factors+affect+solubilityPDF 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_off000105a8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105A8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011dbf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11DBF	10676 bytes
SHA-256: `1a95aaab11890fc85efdb0312e35c0552846dd2b10fda51fc0014cfd7a9da42f`
`font_02_sfnt_off0001366a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1366A	17220 bytes
SHA-256: `817d7c8ffd8268991a36886634f51e1300a8655e47e2c9926a37052120639269`

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